Russian President Vladimir Putin, second right, Speaker of Crimean parliament Vladimir Konstantinov, second left, Crimean Premier Sergei Aksyonov, left, and Sevastopol mayor Alexei Chalyi, right, sit during a signing ceremony for the treaty to join Crimea with Russia in the Kremlin, Moscow, Tuesday, March 18, 2014. President Vladimir Putin on Tuesday signed a treaty to incorporate Crimea into Russia, describing the move as the restoration of historic injustice and a necessary response to what he called the Western encroachment on Russia’s vital interests. (AP Photo/Alexander Zemlianichenko)