The United States and Germany are poised to boost Ukraine’s war effort with the delivery of heavy tanks, sources said, support Russia condemned as a “blatant provocation”. Reuters reports that the expected tank deliveries come as Ukraine dismissed several senior officials as part of an anti-corruption drive, an issue that has become even more important given the need to keep Western backers onside. Washington was expected to announce as soon as Wednesday that it will send M1 Abrams tanks and Berlin has decided to dispatch Leopard 2 tanks, the sources said.