The European Union stands at a crossroads. The shape it takes five years from now will be decided in the coming three to five months.

Year after year, the EU has successfully muddled through its difficulties. But now it has to deal with two sources of existential crisis: Greece and Ukraine. That may prove too much.

Greece's long-festering crisis has been mishandled by all parties from the outset. Emotions now are running so high that muddling through is the only constructive alternative.