The Kremlin has claimed it has downed two Ukrainian missiles aimed at Russia's Kerch Bridge to Crimea - as video shows smoke billowing over the crucial link to the annexed peninsula. The 12-mile crossing carries heavy significance for Moscow, both logistically and psychologically, as a key artery for military and civilian supplies and as an assertion of Kremlin control of the peninsula it illegally annexed in 2014. Russia's foreign ministry vowed retaliation for what it called a 'terrorist attack' on the bridge in Crimea.