Ukrainian President Petro Poroshenko has suffered another crushing defeat. Less than a week after negotiating the renewal of the so-called Minsk ceasefire agreement with Russian President Vladimir Putin, his soldiers have come limping ab of Debaltseve, a road and rail hub in eastern Ukraine that pro-Russian rebels were besieging even as the talks dragged through the night. Not only does the fierce fighting cast doubt on the chance for a lasting truce, but it puts the Ukrainian president in an increasingly difficult position domestically … Crimea has been lost, the economy is cratering, and more than 5,000 people have been killed in a war with murky origins and little purpose.