Bucharest 9 + Nordic Summit on 13 May at Cotroceni: NATO’s Eastern Flank Tests the Transatlantic Bond Without Trump
The President of Romania, Nicușor Dan, will host on Wednesday, 13 May 2026, at the Cotroceni Palace in Bucharest, the Summit of the Bucharest Nine (B9) Format together with the Nordic countries. Co-chaired by President Dan and the President of Poland, Karol Nawrocki, the meeting will run under the overarching theme of “Delivering More for Transatlantic Security”. The format brings together NATO’s Eastern Flank in one of the most strategically charged moments since the alliance’s eastward expansion, against a domestic political backdrop of acute crisis in Romania following the fall of the Bolojan government on 5 May.
The B9 format and its expansion
The Bucharest 9 format was launched in 2015 by Romania and Poland as a coordination mechanism for NATO’s Eastern Flank countries: Romania, Poland, Bulgaria, Hungary, the Czech Republic, Slovakia, Estonia, Lithuania and Latvia. The 13 May summit at Cotroceni extends the framework to the Nordic countries — Finland, Denmark, Iceland, Sweden and Norway — three of which have joined NATO since 2023, transforming the alliance’s northern security architecture. NATO Secretary General Mark Rutte has been invited and is expected to attend. The expansion conversation has already produced informal references to a possible “B11” or “B12” architecture, though formal expansion is not on the 13 May agenda.
Trump declines, DiNanno represents Washington
Among the diplomatic signals from the run-up to the summit, the most notable concerns the United States. President Donald Trump was invited to the Bucharest meeting but declined through diplomatic channels, designating instead Thomas DiNanno to represent the US administration. Earlier speculation that Secretary of State Marco Rubio might attend in Trump’s place did not materialise. The choice of representative — DiNanno is a senior counter-proliferation official rather than a cabinet-level figure — has been read in Brussels and Bucharest as confirmation of Washington’s reduced engagement with multilateral frameworks on NATO’s Eastern Flank, even as the political importance of the format grows.
Defence spending and the 5% threshold
The summit’s substantive agenda is dominated by defence spending. At the Vilnius B9 summit in 2025, the participating heads of state confirmed they were moving towards an allocation of at least 5% of GDP for defence and defence-related investments, well beyond the 2% NATO baseline. Romania committed publicly to this trajectory, even as its post-Bolojan economic outlook complicates the fiscal arithmetic. Sweden, Finland and the Baltic states have already increased their defence budgets sharply since 2022. The 13 May joint declaration is expected to reaffirm these commitments and to specify additional categories of defence-related spending, including critical infrastructure protection and dual-use technology.
Russia, Ukraine and the strategic environment
The B9 + Nordic format will reaffirm that Russia remains “the most significant, long-term and direct threat to Euro-Atlantic security” — language consistent with the Vilnius declaration and with NATO’s official position. The summit will also address the EU’s contribution to Ukraine’s reconstruction and security, and the practical coordination between the Eastern Flank countries on military mobility, ammunition production and logistics. Romania’s role as the southern anchor of the Eastern Flank, with strategic Black Sea coastline, gives Bucharest particular leverage in this conversation.
Romania’s domestic crisis as silent backdrop
The summit takes place in the middle of an acute domestic political crisis in Romania. The Bolojan government fell to a no-confidence vote on 5 May 2026 with 281 votes in favour — the highest score for a successful motion since the post-1989 era. President Dan is reportedly seeking to conclude the first round of consultations with party leaders by 7 May, in order to focus on the B9 summit from 7 to 13 May. The diplomatic pressure of hosting one of the most consequential NATO Eastern Flank summits in years, while simultaneously navigating a government formation crisis, is unprecedented in the post-1989 history of the Romanian presidency.
The strategic stakes
Beyond the symbolic and procedural aspects, the 13 May summit will test three strategic propositions: whether the Eastern Flank can develop a coherent voice on European security independent of Washington’s direct engagement; whether the integration of the Nordic countries genuinely strengthens the format’s leverage at NATO HQ; and whether Romania can convert its host role into lasting diplomatic capital despite the domestic political turbulence. The closing declaration, expected on the evening of 13 May, will be parsed for signals on each of these questions — and will set the tone for the wider NATO summit cycle later in 2026.
