A year after Putin's invasion: How might the violence in Ukraine come to an end?

Starting a war is simple. Ending it, though, is quite a bit more difficult. At the beginning of almost every military conflagration is the illusion that one’s opponent will be relatively easy to defeat.

When German troops headed off to the front in August 1941, they scrawled "Vacation to Paris" on their train cars. Hitler’s "blitzkrieg" ended up lasting six years.