The content originally appeared on: CNN (CNN)When a series of explosions rocked a Russian air base in Crimea on Tuesday, sending Russian vacationers fleeing from nearby beaches, it was clearly an embarrassment for Moscow. Western officials and analysts have since offered competing explanations about the cause. The Russian Defense Ministry said the explosions - which sent enormous columns of smoke over the surrounding area - were caused by the accidental detonation of ammunition, and that no aircraft had been damaged. […]