The Russian Defense Ministry launches nuclear-capable Kalibr cruise missiles with a range of 2,000 km during naval exercies.

Russia says its Black Sea Fleet is monitoring NATO warships in the sea, as the military bloc has increased its presence and boosted its activities there.

Azerbaijan, Georgia, Romania and Turkmenistan have agreed on creating the corridor.

Russia warns a US warship in the Black Sea against approaching its coasts, saying it is closely monitoring the destroyer’s actions.

Two crew members have been found dead and another four were missing after a Panama-flagged cargo ship sunk off Turkey's Black Sea coast.

The United States has sent a guided-missile destroyer near the contested waters of the Sea of Japan, off the Russian coast.

European leaders have rebuffed calls from Ukraine for greater support against Russia after Kiev urged NATO to send ships into waters disputed with Moscow.

An academic says Poroshenko is seeking to strengthen his position domestically by provoking the incident in the Kerch Strait and that there is no threat of war with Russia.

The US and EU have already imposed sanctions on Russia over the Ukraine crisis.

Russia says it has been forced to open fire at and impound three Ukrainian naval vessels after they illegally crossed its sea border, entering the Russian waters in the Black Sea off the Crimean Peninsula.