AN EXPLOSION has rocked a Russian airbase in Crimea as horrified tourists watched from a nearby beach. The blast comes just hours after Putin's humiliated troops were forced to pull out of a key occupied city in Ukraine. The cause of the explosion, which sent sparks and plumes of smoke into the air, is currently unknown. But according to the Russian-appointed head of occupied Sevastopol, the explosion was caused when on board munitions detonated on a military aircraft that overshot the runway at Belbek airport. There were no immediate reports of missile strikes on the plane or airport by Ukraine....