The helicopter cut through the gray sky, following the path of the razor-wire fence below it. Lt. Col. Uiry Trubachov, of Ukraine’s Border Guard Service, squinted up at the chopper. “Those are Russians,” he said. Before Russia’s invasion and annexation of Ukraine’s Crimean Peninsula in 2014, the border barriers didn’t …

A Russian lawmaker is encouraging residents of rebel-controlled areas of Ukraine to join the Russian army, a sign that Moscow is continuing to try to integrate those territories as much as possible amid Western fears that Russia is planning to invade Ukraine. Viktor Vodolatsky said Saturday that residents of the …

As Russia masses tens of thousands of troops on its border with Ukraine, along with tanks, artillery and missiles capable of striking the capital, officials in Washington, Kyiv and across Europe are debating the likelihood and timing of an invasion. In one camp, officials in Washington, London and within Ukraine’s …