NATO ends its practical cooperation with Russia, due to tensions in Ukraine. NATO is currently reconsidering its cooperation with Russia, Secretary

Russian President Vladimir Putin on Monday signed a diploma recognizing the Republic of Crimea as a sovereign and independent State, a day after the Crimean voted to secede from Ukraine.

Turkey could close the Bosphorus for Russian ships, if there is violence against Crimean Tatars, said Turkish Prime Minister Recep Erdogan.