Russian servicemen drive tanks during military exercises in the Leningrad Region, Russia, in this handout picture released February 14, 2022. Russian Defence Ministry/Handout via REUTERS Ukraine said it had been hit by a cyber attack on Tuesday, appearing to blame Russia, as Moscow’s statements about a partial troop pullback were met with Western skepticism. US President Joe Biden warned he would move with allies to respond to the cyber hacks and said a Russian attack remained a possibility. East-West relations are facing one of their deepest crises in decades over Ukraine, post-Cold War influence on the continent, and energy supplies....