The trouble with leading a great power is that, from time to time, the president is obliged to act like the leader of a great power. If ever there was a time for sound presidential leadership, it’s now. With no appreciation for the endlessly renewable force of national self-preservation that animates Moscow’s maneuvers in Ukraine, President Biden’s insulting remarks and hostile sanctions have plunged the United States into a deeper, more dangerous confrontation with Russia in Ukraine, a region...

















