Nato military exercises begin in Black Sea
Nato warships have begun military training exercises in the Black Sea, in international waters off the coast of Bulgaria.
The mission is aimed at reassuring its members in Eastern Europe in the face of Russia's increasingly unpredictable behaviour.
The Kremlin has accused Nato of "aggressive war games" and warns that its presence close to the Russian border could have serious consequences for the settlement of the Ukraine conflict.
Europe Correspondent Gavin Lee spent a day with Nato on one of the ships during their training mission.