Russia’s invasion of Ukraine was a tragedy and a crime, but it does not threaten American security. Even the Brookings Institution’s Robert Kagan, who has yet to find a war he doesn’t want the U.S. to fight—his new book blames America for not having stopped Adolf Hitler—admitted that Ukraine is not important for this country’s defense. Kagan was categorical: “There is no way that Putin’s conquest of Ukraine has any immediate or even distant effect on American security.” Yet he still supports Washington’s proxy war against Russia, like many others. Those who, like Republican Senate Minority Leader Mitch McConnell of...