Open this photo in gallery: Ukrainian soldiers repair a vehicle near the border with Russia’s Kursk region, on Jan. 9.FINBARR O'REILLY/The New York Times News Service Russia battled on Sunday to drive the last Ukrainian soldiers from western Russia, Russian officials said, after a seven-month incursion by Ukraine that aimed to distract Moscow’s forces, gain a bargaining chip and rile President Vladimir Putin. In one of the most striking battles of the three-year-old Ukraine war, Ukrainian forces smashed their way across Russia’s western border in Kursk last August, marking the biggest attack on sovereign Russian territory since the Nazi invasion...