The Ukrainian navy has accused Russia of opening fire on some of its ships off the coast of the annexed Crimea.<br />Sunday's announcement was made after a day of rising tensions during which Moscow accused the Ukraine of illegally entering Russian waters. <br />Russia placed a huge cargo ship under a bridge in the Kerch Strait to block three Ukrainian navy vessels from entering the Sea of Azov.<br />Ukraine's navy claimed Russian fire damaged two small artillery boats and injured two crewmembers.<br />It added that the two ships, plus another, were then seized by Russian Special Forces.<br />Ukrainian president Petro Poroshenko has called an emergency session of his war cabinet to discuss the situation.<br />Russia is yet to comment on the allegations. <br />
