As we approach the first anniversary of Russia’s brutal and unprovoked invasion of Ukraine, two ominous trends are emerging at once. First, Russia is doubling down. It’s pouring fresh troops into Ukraine and launching new offensive operations. Second, poll after poll after poll demonstrate that American support for Ukraine is slipping away. While Americans have sympathy for Ukraine, declining percentages are willing to spend American resources to keep Ukraine in the fight. Yet the outcome of the war is simply too important — to America as well as Ukraine — to allow our support to falter. On the war’s anniversary...