Q: What moves could the United States make beyond sanctions right now that would help protect Ukraine? A: The most important move now is for the president to announce Vladimir Putin is a war criminal. Really. This gives enormous diplomatic leverage and a greater incentive to help the campaign. ... Q: You advocate a no-fly zone? A: Absolutely. The airspace belongs to Ukraine. If they ask for help, why can’t we fly airplanes in there? Say, oh, it’s because of the Russians, they might come up and contest it. That’s the Russians’ problem. They’re going to get shot down. Okay,...