By Maria Tsvetkova and Andrea Shalal MOSCOW/WASHINGTON (Reuters) – Ukraine said its defence ministry and two banks had been hacked on Tuesday, appearing to blame Russia, as the West sought evidence from Moscow of a partial troop pullback. The Kremlin, the United States and Europe are engaged in one of the deepest crises in East-West relations for decades over Ukraine, post-Cold War influence on the continent and energy supplies as Moscow wants to stop Kyiv ever joining NATO. Western nations have suggested arms control and confidence-building steps to defuse the standoff and want Russia to reve…