THE DEATH of Alexei Navalny, Russia’s foremost opposition leader, in a Siberian gulag on February 16th would by itself have served as a shock to Europe. But for leaders gathered at the Munich Security Conference, an annual gathering of defence and security bigwigs, Mr Navalny’s demise was just one of several ominous developments for the continent. On February 17th Ukraine’s army, starved of American ammunition by Congress’s failure to pass a supplemental aid bill, was forced to withdraw from the eastern town of Avdiivka. That handed Vladimir Putin his first military victory in almost a year.The deadlock in Congress reflects...