On Tuesday evening, the ships of the second permanent naval group of NATO have entered the Black Sea.
The group, which is currently located near Russian borders, includes frigates of the naval forces of Spain, Turkey and Germany. The flagship is the British missile destroyer HMS Duncan.
There are specific treaties which govern how many, and for how long, NATO ships may be in the Black Sea, despite that Romania is a NATO partner. The US has recently violated this treaty, and was called to task on it.
As a result, what becomes of this Martime Group 2 deployment will be an interesting development, especially in light of growing US-Russia tensions over Ukraine and Syria.