How EU leaders can prevent a no-deal Brexit

HAS British Prime Minister Theresa May outmanoeuvred all her opponents? By defeating Parliament's effort to rule out a disorderly "no-deal" rupture between the European Union and its second-largest trading partner, Mrs May has redoubled pressure on EU leaders to accept her demands by the Brexit deadline of March 29.

Holding a gun to one's own head is rarely a successful negotiating strategy, as Greece discovered when it threatened to leave the euro. But a collapse of trade with Britain is a far more alarming prospect. Moreo…