Ukraine warned of an escalating conflict in its easternmost regions as U.S. President Barack Obama headed to eastern Europe to reassure NATO members. Ukraine’s army will take on Russia’s “full-scale invasion,” Defense Minister Valeriy Geletey said on Facebook, a shift away from the government’s earlier communication that focused on battling insurgents. Obama will visit Tallinn, Estonia, on his way to this week’s North Atlantic Treaty Organization summit in the U.K. He’ll meet the leaders of Estonia, Latvia and Lithuania, three former Soviet republics that are now part of the military alliance. Ukraine and its allies ... (full story)