"The forces of the Black Sea took under escort a group of NATO vessels, consisting of three frigates from the Netherlands, Canada, and Spain that have entered the Black Sea", the Russian National Defence Control Centre said.
According to the Standing NATO Maritime Group Two, the frigates, engaged in the drills are the Netherlands' HNLMS Evertsen, Spain's ESPS Santa Maria, Canada's HMCS Toronto, Bulgaria's BGS Drazki, Turkey's TCG Yildirim, and Romania's ROS Regele Ferdinand.
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Earlier this year, NATO Secretary General Jens Stoltenberg said that the organisation was considering the possibility of providing additional support to Ukraine, as well as expanding its presence in the Black Sea.
Moscow has repeatedly warned that the military buildup of the alliance near Russia's state borders could boost the potential risks of provoking a military confrontation.