President Donald Trump is flexing new leverage in the war in Ukraine — allowing the nation to use U.S. weapons to strike deep into Russia, weighing whether to provide Kyiv with Tomahawk cruise missiles and vowing Ukraine can take back all its land — while pressing China and India to slash purchases Russian oil. Ukraine supporters are cheering the shift, noting that after months of frustration over the grinding conflict, Trump appears to be changing tactics. From a combative February meeting with President Volodymyr Zelenskyy to his declaration last week that Ukraine could reclaim all of its original territory, the...