The U.S. will back Ukraine in its war with Russia for “as long as it takes,” President Biden said Tuesday night, pledging indefinite American backing for Kyiv as the war enters its second year with no clear path toward peace. In his State of the Union address, Mr. Biden said the U.S. and its Western allies have stood together against Russian President Vladimir Putin’s war in Ukraine, calling the conflict a “test for the ages” that the free world has met. “I spoke from this chamber one year ago, just days after Vladimir Putin unleashed his brutal war against Ukraine....