A quick history lesson that will help you understand what's going on in Ukraine

AUSTIN (KXAN) -- After weeks of American officials warning that an imminent invasion of Ukraine from Russia was coming, President Vladimir Putin officially launched an attack on its neighbor and threatened to go toe-to-toe with NATO in a chilling speech overnight our time.
Ukrainian officials reported tanks and troops were moving across the border into Ukraine while American journalists on the ground reported hearing explosions -- believed to be airstrikes or shelling hitting bases and even citi