NATO's response to Russia's latest incursion into Ukrainian territory came into focus on Aug. 28 - and it's forceful. Russian tanks, troops, and artillery reportedly crossed into a previously unbreached border of eastern Ukraine on Tuesday, Aug. 26, opening a third front near the city of Novoazovsk and leading Ukrainian forces into a chaotic retreat. Western officials told the New York Times that they fear Russia is carving out a land bridge to the Crimean peninsula, which Russia annexed earlier this year.