Two Russian naval vessels are closely escorting NATO warships in the Black Sea that are headed toward Ukraine, the Russian Defense Ministry said Thursday.

The commander of a NATO maritime group said Dutch, Spanish, Canadian, Turkish, Romanian and Bulgarian frigates entered the Black Sea on Thursday. The warships are part of the alliance’s defense cooperation exercises taking place on April 8-12. Two of the frigates are scheduled to make a port call in the Ukrainian city of Odessa on April 1.

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Turkish media published a video of the frigates crossing the Bosphorus en route to the Black Sea.