U.S. warns of possible Russian invasion of Ukraine with 175,000 troops as soon as January

U.S. intelligence is warning of a possible Russian invasion of Ukraine involving as many as 175,000 troops as soon as January, a U.S. official confirmed to CBS News following a Friday report in The Washington Post about the scale of a possible offensive.

The plans involve extensive movement of 100 battalion tactical groups with an estimated 175,000 personnel, along with armor, artillery and equipment, according to an administration official. 

Roughly 70,000 Russian troops are currently deployed opposite Ukraine, although they lack the support units needed to launch an invasion. That support would come from reservists.