MOSCOW—Russia is prepared to target intruding warships if they fail to heed warnings, a senior Russian diplomat said Thursday in a tough statement in the wake of a Black Sea incident in which a British destroyer sailed near Crimea in an area that Russia claims as its territorial waters. Russia said one of its warships…

MOSCOW—Two Russian warships transited the Bosphorus en route to the Black Sea on Saturday and 15 smaller vessels completed a transfer to the sea as Moscow beefs up its naval presence at a time of tense relations with the West and Ukraine. The reinforcement coincides with a huge build-up of Russian troops near Ukraine, something…

The United States will send two warships to the Black Sea next week, Turkey’s foreign ministry said on Friday, prompting Russia, which has boosted its military forces near Ukraine, to raise concerns about NATO powers that do not have a coast line in the region of increasing naval activity. “A notice was sent to us…

KYIV—President Volodymyr Zelenskiy called on NATO on Tuesday to lay out a path for Ukraine to join the Western military alliance, after days in which Russia has massed troops near the conflict-hit Donbass region. Zelenskiy’s comments drew an immediate rebuke from Moscow, which said Kyiv’s approach to NATO could further inflame the situation in Donbass,…