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Russia’s full-scale invasion of Ukraine has recast the Black Sea from a perceived strategic periphery into one of the most contested maritime and hybrid theatres in the Euro-Atlantic space. In this environment, Romania has shifted from the margins of European security debates to a pivotal position within NATO’s eastern-flank posture. This article examines Romania’s evolving defence and deterrence architecture, NATO’s recalibrated force posture, and the regional security complex shaped by Russia’s militarisation of Crimea, Ukraine’s constrained maritime access, Moldova’s structural fragility, and Turkey’s balancing behaviour. It situates Romania’s Black Sea strategy at the intersection of military, energy, and hybrid-security dynamics, drawing on NATO strategic documents, national defence planning materials, cyber-security reporting, and Eurobarometer survey data. The central argument is that Romania’s long-term stability depends on a coherent Black Sea strategy anchored in credible deterrence, resilient institutions, and proactive regional leadership that integrates security, energy, and governance agendas rather than treating them as discrete policy silos. The article’s policy contribution is to argue that Romania should prioritise a sequenced agenda that links naval modernisation, hybrid-resilience measures, and energy-security investments within a single Black Sea framework, enabling a shift from a reactive frontline posture to a more strategic regional role. Unlike most existing Black Sea security studies, it advances an integrated, Romania-centred perspective that connects defence posture, offshore infrastructure, and institutional capacity.

Key indicators (2015-2025)

Romania’s changing strategic profile is visible in a set of quantitative indicators that capture both hard-security commitments and societal support.

Defence expenditure has risen steadily over the last decade, moving from below NATO’s 2% benchmark in the mid-2010s to 2% of GDP in 2023 and an estimated 2.5% of GDP in 2025, signalling a credible and sustained commitment to burden-sharing and capability modernisation (Ministry of Defence Romania, 2024; NATO, 2025). Approximately 3,000 United States rotational troops stationed on Romanian territory, together with a strengthened France-led multinational battlegroup, underscore Romania’s role as a frontline host nation and key contributor to NATO’s deterrence posture along the Black Sea rim.

Public-opinion data reinforces the political sustainability of this trajectory. Eurobarometer 103 (2025) indicates that 78% of Romanian respondents express support for NATO membership, and trust in NATO as a security provider remains structurally high. By contrast, trust in national government is more volatile and sensitive to domestic political dynamics. This asymmetry – higher trust in NATO than in domestic political institutions – creates both an enabling environment for defence investment and a latent risk that governance deficits may be obscured by reliance on external security guarantees rather than addressed through structural reform.

Introduction – Why the Black Sea matters now

Prior to 2014, the Black Sea was frequently characterised in allied discourse as a secondary or “flank of a flank” theatre. Russia’s annexation and subsequent militarisation of Crimea fundamentally altered this perception. The deployment of layered anti-access/area-denial (A2/AD) systems, including coastal missile batteries, advanced air-defence platforms, and integrated radar networks, has given Moscow the capacity to shape naval, air, and commercial activity across much of the basin (NATO, 2025). For Romania, this transformation is not an abstract shift in the balance of power. It has concrete implications for maritime trade routes, offshore energy infrastructure, the security of critical undersea cables, and the broader stability of NATO’s eastern flank.

The Black Sea now functions as a laboratory of multidomain competition in which kinetic operations, hybrid tactics, and economic coercion intersect, providing a real-time testing ground for NATO’s adaptation of its deterrence and defence posture and for EU efforts to strengthen resilience across critical sectors. Russia’s control of key maritime corridors, combined with recurrent escalatory behaviour – strikes on Ukrainian ports, harassment of commercial vessels, and episodic signalling near NATO maritime and air assets – has reconfigured the regional threat landscape. Critical nodes, including the Bosphorus-Dardanelles chokepoint, the Danube Delta, and offshore energy platforms, have become pressure points where relatively small incidents can generate outsized escalation risks.

For Romania, the Black Sea is no longer a buffer zone, but an extension of its national security perimeter. Constanța’s role as a deep-sea port, the Danube corridor’s function as a logistics artery, and the proximity of Moldova and southern Ukraine align Romania’s security, economic, and political exposure in ways that make the Black Sea central to any credible national-security strategy.

Romania’s defence posture and NATO integration

Romania’s defence transformation over the past decade has been driven by a convergence of national threat perceptions and allied expectations. The shift from incremental modernisation to accelerated capability development is anchored in both domestic consensus on the risks posed by Russian revisionism and Romania’s deepening integration into NATO’s deterrence architecture.

Defence spending and capability depth

Romania has made appreciable progress in land and air capabilities, even as its maritime dimension remains comparatively underdeveloped. Major acquisitions since 2015 include Patriot air and missile defence systems, HIMARS long-range rocket artillery, successive tranches of F-16 aircraft from Portugal and Norway, and the 2024 approval of a transition to fifth-generation F-35 fighters. These investments provide Romania with layered air defence, long-range precision strike, and enhanced interoperability with key allies (Ministry of Defence Romania, 2024; NATO, 2025).

By contrast, naval modernisation has lagged behind. Protracted delays in frigate upgrades and corvette procurement have limited Romania’s ability to project presence and conduct sustained operations in the Black Sea. This shortfall creates a structural reliance on allied naval assets for deterrence, maritime surveillance, and the protection of sea lines of communication. The capability gap complicates Romania’s capacity to autonomously secure its Exclusive Economic Zone (EEZ), defend offshore energy infrastructure, and respond robustly to grey-zone incidents at sea.

Infrastructure as strategy

Infrastructure has become a core component of Romania’s strategic posture. The transformation of Mihail Kogălniceanu Air Base (MKAB) into a principal regional hub illustrates how host-nation support, prepositioned equipment, and expanded intelligence, surveillance, and reconnaissance (ISR) capabilities are being leveraged to deepen integration with NATO’s operational planning. MKAB consolidates Romania’s role as a logistics and air-mobility hub for the Black Sea region and the broader eastern flank, enhancing reinforcement options in a crisis.

Beyond MKAB, investments in rail, road, and port infrastructure – often co-financed with EU funds – have pronounced dual-use relevance. They underpin both military mobility and the civilian flows that connect Romania to Ukraine, Moldova, and wider European markets. The entanglement of civilian and military infrastructure further underscores why governance quality and EU-funds absorption capacity, analysed in other articles of this series, form part of the broader security equation.

Black Sea security dynamics: Risks and strategic shifts

NATO’s eastern flank transformation

Since 2022, NATO has undertaken a substantial recalibration of its eastern-flank posture, moving from tripwire models to credible forward defence. Enhanced Vigilance Activities and new multinational battlegroups, including the France-led formation in Romania, have expanded ISR networks, integrated air and missile defence, and deepened joint training and contingency planning (NATO, 2025). These measures are complemented by the gradual implementation of NATO’s new Force Model, the prepositioning of equipment, and refined regional defence plans that explicitly identify the Black Sea as a critical theatre. Romania thus serves simultaneously as a staging area for reinforcement, a command-and-control hub for selected regional activities, and a long-term anchor for deterrence along the Black Sea rim.

Russia’s military posture

Russia’s Black Sea posture is anchored in a layered A2/AD architecture emanating from militarised nodes in Crimea and along its Black Sea coast. The system integrates coastal missile platforms, advanced radar arrays, electronic warfare capabilities, and naval aviation units, allowing Russia to disrupt commercial and military activity, impose de facto sea-denial zones, and conduct long-range precision strikes (Black Sea Security Forum, 2024). In practice, this architecture combines shore-based anti-ship systems, long-range Kalibr-capable platforms, integrated air-defence assets, and dense electronic-warfare coverage, creating a contested environment in which both commercial shipping and allied naval deployments face persistent risk. Despite significant wartime losses inflicted by Ukraine – including the degradation of several high-value naval units and logistical nodes – the residual capacity of Russia’s Black Sea Fleet, reinforced by land-based missiles and unmanned systems, remains sufficient to challenge allied freedom of navigation, raise the cost of maritime presence, and complicate NATO operational planning in the region.

Geostrategic nodes and regional partners

Three geostrategic nodes structure Romania’s threat environment. First, Crimea functions as Russia’s primary platform for regional power projection and coercive signalling, hosting key elements of the Black Sea Fleet, long-range strike systems, and intelligence assets that can be directed against both Ukraine and NATO allies. Second, the Bosphorus-Dardanelles Strait, governed by the Montreux Convention, regulates naval access and constrains the scope for permanent NATO naval presence in the Black Sea, effectively shaping the rhythm and scale of allied maritime deployments. Third, the Danube Delta and nearby maritime approaches have become increasingly exposed to drone strikes, debris, and spillover incidents from the war in Ukraine, directly affecting Romanian territory and testing crisis-management mechanisms, civil-military coordination, and communication strategies with domestic and international audiences.

Ukraine’s restricted maritime access has elevated Romania’s importance as a logistical corridor. Constanța and the Danube ports have become central to Ukraine’s western export routes, particularly for grain, thereby deepening economic and political interdependence between the two states. Moldova’s exposure to Russian energy leverage, disinformation, and political destabilisation attempts situates Romania as its principal external anchor and conduit to the EU, further tightening the link between Black Sea security and domestic resilience in both countries.

Turkey’s balancing role adds another layer of complexity. As a NATO member with its own strategic calculus and a dense web of relations with Russia, Turkey’s implementation of Montreux provisions shapes the operational environment for both allied and Russian navies. This indirect influence elevates the relative importance of Romania and Bulgaria as hosts for land, air, and limited naval deployments that underpin NATO’s Black Sea posture.

The energy-security nexus

The Black Sea is not only a theatre of military contestation but also an energy frontier. Constraints on NATO naval presence, combined with Russia’s capacity for hybrid disruption, have increased Romania’s responsibility for safeguarding maritime transport routes, offshore infrastructure, and subsea connectors. Ensuring secure maritime flows through Constanța and along the Danube has thus become an EU-level strategic priority (European Commission, 2024).

Romania is among the EU member states least dependent on Russian natural gas, owing to a relatively diversified domestic production base and existing interconnector infrastructure. However, low import dependence does not equate to low vulnerability. Offshore energy infrastructure, subsea cables, and gas platforms located in Romania’s EEZ are exposed to hybrid and kinetic risks, including sabotage, interference by state and non-state actors, and coercive signalling in contested waters (Ciorobea, 2025). The Neptun Deep offshore gas project, expected to come online around 2027-2028, could enhance regional energy resilience and reduce vulnerability to external supply shocks, but its development also increases the strategic value – and thus the potential risk – of Romania’s offshore zone.

This energy-security nexus ties Romania’s Black Sea posture to broader EU objectives related to diversification, decarbonisation, and critical-infrastructure protection. Decisions on pipeline routing, LNG capacities, offshore exploration, and grid interconnections therefore have direct implications for Romania’s security strategy and its capacity to act as a regional provider of energy stability. These choices also shape the menu of strategic options discussed later in the article, particularly Romania’s potential to leverage an energy-security pivot as a complement to deeper NATO integration and enhanced regional leadership.

Hybrid competition in the Black Sea region increasingly merges cyber, maritime, informational, and kinetic vectors. Maritime hybrid tactics – such as GPS spoofing, electronic interference along shipping routes, and drone incursions targeting port and energy infrastructure – reflect a strategy of persistent, low-intensity pressure designed to erode situational awareness, raise insurance and transaction costs, and test allied thresholds (Ciorobea, 2025).

Disinformation campaigns target Romanian and regional audiences by amplifying scepticism toward NATO, EU institutions, and support for Ukraine, while exploiting domestic grievances related to economic inequality, governance, and energy prices (ENISA, 2024; CERT-RO, 2024). These narratives aim to fragment societal cohesion and weaken elite consensus on Romania’s strategic orientation. At the same time, physical incidents, including drone fragments detected near Danube ports and other border areas, probe crisis-management systems and risk miscalculation if not handled with calibrated transparency and communication.

Cyberattacks have grown in both volume and sophistication. CERT-RO reports a cumulative increase of over 300% in detected incidents since 2015, with peaks associated with moments of heightened regional tension (CERT-RO, 2024). Critical sectors such as energy, transport, and public administration are among the most targeted. While Romania has made progress in establishing cybersecurity frameworks, incident-response teams, and public–private partnerships, institutional fragmentation and uneven capabilities across agencies still constrain resilience.

Strengthening resilience to hybrid threats therefore requires more than technical fixes. It demands integrated civil-military planning, robust interagency information-sharing, and sustained investment in public communication and societal resilience. In this sense, internal governance quality – transparency, accountability, and trust in institutions – constitutes a key enabling or constraining factor for Romania’s capacity to withstand hybrid pressure.

Strategic options for Romania (2025-2030)

Looking toward 2030, Romania faces several strategic choices in structuring its Black Sea strategy. These options are not mutually exclusive, but they emphasise different instruments, coalitions, and time horizons. They are also conditioned by domestic constraints – fiscal space, institutional capacity, and political volatility – which shape how far each pathway can realistically be pursued.

One pathway centres on deepening NATO integration. Under this option, Romania would continue to prioritise forward presence, capability development, and interoperability, leveraging its role as a host nation for allied forces and infrastructure. The advantage lies in strong deterrence, access to advanced capabilities, and shared planning that embeds Romania within allied contingency frameworks. However, this approach remains sensitive to shifts in transatlantic politics and the durability of U.S. and Western European commitments. It also carries the risk of reinforcing a perception of Romania as primarily a security consumer, unless accompanied by credible investments in national capabilities – particularly at sea – and a more visible contribution to regional initiatives.

A second pathway emphasises regional leadership in formats such as Romania–Poland–Ukraine cooperation, the Bucharest Nine, or broader trilateral and quadrilateral arrangements. Here, Romania would use its relative energy resilience, logistical role, and NATO/EU memberships to shape regional initiatives, including infrastructure corridors, defence-industrial cooperation, and coordinated resilience planning for hybrid threats. This approach promises greater regional agency and the ability to influence agendas rather than merely adapt to them. Yet it requires sustained diplomatic investment, higher defence and resilience spending, and careful management of Ukraine’s and Moldova’s trajectories to avoid overextension or misaligned expectations among partners.

A third pathway focuses on aligning more closely with emerging EU debates on strategic autonomy, defence-industrial policy, and critical-infrastructure protection. Romania could position itself as a contributor to EU-level capability development, defence innovation, and resilience initiatives, integrating Black Sea security into a wider European framework. Potential benefits include access to EU funding instruments, participation in industrial consortia, and greater visibility in Brussels-level agenda setting. At the same time, decision-making at the EU level can be slow and consensus-dependent, and there is a risk that national priorities may be diluted if Romania does not clearly articulate its Black Sea interests within these broader debates.

Finally, an energy-security pivot would seek to capitalise on Romania’s offshore resources, interconnector network, and relatively diversified energy mix to make the country a regional hub for energy stability. This option would require significant investment in infrastructure, regulatory stability, and close coordination with EU energy and climate objectives, but it could enhance Romania’s leverage in both security and economic terms. The development of Neptun Deep, the consolidation of gas and electricity interconnectors, and participation in regional energy platforms would allow Romania to underwrite resilience for neighbouring states while also reinforcing its own strategic autonomy. The risk is that energy projects become decoupled from broader security planning or are delayed by domestic regulatory uncertainty and governance weaknesses.

In practice, Romania will likely blend elements of all four pathways. The strategic challenge lies in sequencing and coordination: ensuring that deepened NATO integration, regional leadership, EU-level engagement, and energy strategy reinforce rather than dilute one another. Achieving this requires a whole-of-government approach that aligns defence planning, foreign policy, energy strategy, and domestic governance reform under a single Black Sea framework, supported by realistic resource planning and stable political consensus.

Conclusion – From frontline state to strategic actor

Romania’s position in the Black Sea region has been irrevocably altered by Russia’s war against Ukraine and the broader reconfiguration of European security. No longer a peripheral actor, Romania has become a frontline state whose choices will shape not only national security but also NATO’s credibility and the EU’s capacity to act in its eastern neighbourhood. The analysis presented in this article suggests that Romania has made significant progress in defence modernisation, infrastructure development, and alliance integration, while still confronting persistent gaps in maritime capabilities, hybrid resilience, and institutional coordination.

A coherent Black Sea strategy requires more than higher defence spending and new platforms. It demands the integration of military posture, energy policy, EU funds absorption, and domestic governance reform into a single strategic narrative. Romania’s ability to manage this integration will determine whether it evolves into a strategic actor capable of shaping regional outcomes or remains primarily a security consumer dependent on external guarantees. By 2030, success will be measured not only in capability metrics or deployment numbers but in the degree to which Romania has built resilient institutions, diversified its energy architecture, reduced vulnerabilities to hybrid pressure, and anchored its regional leadership within stable Euro-Atlantic frameworks. In substantive terms, the argument advanced here is that Romania’s long-term stability and influence depend on articulating and implementing an integrated Black Sea strategy that fuses credible deterrence with energy security and governance reform.

References

Black Sea Security Forum. (2024). Black Sea security assessment 2023–2024. Black Sea Strategic Studies Institute.

CERT-RO. (2024). Raport anual privind securitatea cibernetică în România 2015–2023. Centrul Național de Răspuns la Incidente de Securitate Cibernetică.

Ciorobea, R. (2025). Infrastructure vulnerability and hybrid threats in the Black Sea. Bucharest: National Defence University Press.

ENISA. (2024). Threat landscape for hybrid and cyber operations in Europe. European Union Agency for Cybersecurity.

European Commission. (2024). EU energy security and diversification report 2024. European Union.

Eurobarometer. (2025). Standard Eurobarometer 103: Public opinion in the European Union – Romania country factsheet. European Commission.

Ministry of Defence Romania. (2024). White paper on defence 2024. Government of Romania.

NATO. (2025). NATO annual report 2024–2025. NATO Public Diplomacy Division.

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