A long-standing treaty continues to shape how military forces operate in the Black Sea, affecting NATO’s ability to project power in the region. With Ukraine fighting Russia, the question of what NATO can do in nearby waters remains closely tied to rules governing naval presence and movement.
As described by Deutsche Welle, the treaty—dating back roughly 90 years—places constraints on foreign military access to parts of the Black Sea. That limits the degree to which NATO members and partners can freely deploy ships into the area compared with operations in other seas. As a result, even when alliance members seek to increase support for Ukraine, their options for maritime reinforcement can be restricted by legal and procedural requirements.
The reporting frames the issue as a balancing act between security concerns and treaty obligations. It also highlights that the Black Sea’s strategic environment is influenced not only by current conflict dynamics, but also by the persistence of historical agreements that determine which states can enter, how and for how long.
