Starting wars easy; challenge ending them

If Winston Churchill were here – and some of us saw him, or his latest incarnation, this month, addressing the U.S. Congress on the plight of his beleaguered and besieged country – he would not know whether the conflict in Ukraine is only beginning, or is nearing its end, or merely is at the end of its beginning. But as always, the world knows more about how wars begin than how they end.

This parti…