A top Ukrainian army officer said a "full-scale invasion" of his country was under way Thursday, as a U.S. official said up to 1,000 Russian troops had crossed Ukraine's southern border to fight alongside pro-Russian rebels.
NATO released satellite images which it says show Russian self-propelled artillery units moving inside Ukrainian territory.
â€” OutFrontCNN (@OutFrontCNN) August 28, 2014
And new video shows what the Ukrainian government says is a Russian tank farther south, where a new front is opening up in the conflict.
OutFront, Senator Ben Nelson, who just returned from a fact-finding mission to Ukraine.