On Tuesday, one day before the president touted passage of a surpassingly weak U.N. resolution and declared Iran yet more isolated, the leaders of Russia, Turkey and Iran gathered at a security summit in Istanbul “in a display of regional power that appeared to be calculated to test the United States,” as the New York Times put it. I would add: And calculated to demonstrate the hollowness of U.S. claims of Iranian isolation, to flaunt Iran’s growing ties with Russia and quasi-alliance with Turkey, a NATO member no less.