An American destroyer is sailing to the Black Sea to conduct naval exercises with Ukraine to demonstrate “solidarity” in response to a clash with Russia that has a top U.S. admiral furious.

“The whole episode in the Sea of Azov was extremely bothersome to me,” Admiral James Foggo, commander of U.S. naval forces in Europe and Africa, told reporters on the sidelines of the Munich Security Conference over the weekend.

Russian forces fired on three Ukrainian naval vessels that attempted to pass through the Kerch Strait, the narrow waterway that connects the Black Sea to the Sea of Azov, and arrested the sailors in late November.