Dozens of Ukrainian soldiers who had crossed the border into Russia on Monday returned to Ukraine, after both Ukrainian and Russian officials gave conflicting explanations of why the Ukrainian soldiers had entered Russia. WSJ’s Niki Blasina reports. (Photo: AP) Russian President Vladimir Putin said he has ordered his government to prepare retaliatory measures against U.S. and European sanctions imposed on Russia last week, as the Kremlin stepped up pressure on Ukraine. Mr. Putin has shown no outward sign of buckling under the weight of sanctions—the harshest yet imposed by Brussels and Washington—aimed at getting him to stop supporting pro-Russia rebels across the border in Ukraine. The Russian Foreign MInistry described eastern Ukraine as on the verge of a “humanitarian catastrophe” and said Tuesday it would push for an international mission to help masses of civilians fleeing the fighting. At Russia’s request, the United Nations Security Council met for a […]