BRUSSELS/DONETSK Ukraine (Reuters) – EU officials proposed sanctions on Tuesday to starve Russian firms of cash as punishment for Moscow’s role in Ukraine, where rebels said they were storming Donetsk airport, potentially their biggest prize since turning the war’s tide last week. Western countries accuse Moscow of sending armored columns of troops into Ukraine, where the momentum in a five-month war shifted last week decisively in favor of pro-Russian rebels, who are now advancing on a new front towards a major port. Russia denies its troops are involved in fighting on the ground, in the face of what Western countries and Ukraine say is overwhelming evidence. In Washington, Pentagon spokesman Rear Admiral John Kirby estimated there were thousands of Russian forces inside Ukraine. “You want to talk provocative? Let’s talk about a few thousand Russian troops inside eastern Ukraine, continuing to support separatists, with heavy weapon systems, and more […]