Bucharest Nine

The Bucharest Nine (B9) is an informal consultative grouping of nine NATO member states on the alliance's eastern flank: Romania, Poland, the Czech Republic, Slovakia, Hungary, Bulgaria, Estonia, Latvia, and Lithuania. It was established in November 2015 following Russia's annexation of Crimea, providing a dedicated channel for countries most directly exposed to Russian military pressure to coordinate positions within NATO and with the broader alliance. The grouping meets at head-of-state level and issues joint statements that typically signal the eastern flank's collective security priorities.

On 13 May 2026, the B9 held a summit at Cotroceni Palace in Bucharest, joined by Nordic allies. President Zelenskyy addressed the gathering as Russia's 800-drone barrage was under way across Ukraine. The summit's joint statement reaffirmed Ukraine's sovereignty within internationally recognised borders and backed NATO eastern flank reinforcement. Zelenskyy used the occasion to propose bilateral drone deals pairing European industrial capacity with Ukrainian battlefield experience, explicitly framing them as independent of US arms export approval processes.

The B9's significance has grown with each year of the war. As a sub-forum within NATO, it allows eastern-flank states to develop joint positions before wider alliance meetings — giving countries with the highest threat perception a structured amplification mechanism. Hungary's position within the grouping has been complicated by its historically pro-Moscow tilt; the May 2026 summit occurred as Hungary's new government under Péter Magyar (formed 12 May) signalled a departure from Orbán's veto posture on EU Ukraine-related decisions.