Bucharest Summit Expands NATO Eastern Flank Framework (defence24.com)

• Expanded B9 format includes Nordic Allies, Ukraine, US observer.
• Eastern flank now viewed as single strategic space: Black Sea-Baltic-Arctic.
• Emphasis on integrated deterrence and collective defense.

"The Bucharest summit on May 16, 2026, transformed the Bucharest Nine (B9) format by including Nordic Allies, NATO leadership, Ukraine, the United States as an observer, and wider allied participation. This signals that the eastern flank is now viewed as a single strategic space stretching from the Black Sea through the Baltic Sea to the Arctic. The meeting underscores a shift towards integrated deterrence and collective defense across the entire northern region."