David Ignatius: “After talking Sunday with people close to the negotiations, my sense is that the Islamabad impasse won’t necessarily mean a return to war. The blockade is a pressure tactic, to be sure, but not primarily a military one. Trump has no appetite for further armed conflict. He knows that the upsides are limited and the “tail risk,” as financial traders like to say, is large. His aim instead is to put a severely battered Iran into an economic vice to see if its leaders will set a different course in a big, comprehensive deal. The American side expects that despite last weekend’s standoff in Islamabad, contacts will probably continue, through Pakistani intermediaries. Trump’s destination is still the exit ramp.” washingtonpost.com/opinions/…