Steven A. Tananbaum Senior Fellow for International Economics Robert Kahn writes that Greece and its creditors are again locked in a showdown over reforms, cash, and debt relief. Another cliff-hanger ahead of heavy July debt payments looks likely. Extend-and-pretend is a dead end for Greece and an increasingly populist Europe, and a more ambitious agreement seems ruled out by bailout fatigue in creditor countries. Markets are once again underestimating the risks of “Grexit.”