Russia’s invasion of Ukraine might come “any day now,” the Biden administration warns, with intelligence rumors marking Wednesday as a likely date. If Russia does invade, the United States and its allies have pledged to impose “severe economic sanctions” on Russia. The result would be horrible casualties in Ukraine, and, with Russia now supplying as much as 40 percent of Europe’s natural gas, significant economic disruption in both Russia and Europe that would surely affect the rest of the world as well.