New detail about Russian "false flag" plan prompts U.S. to prepare for worst in Ukraine

New granular detail about the planning of a false flag attack in Ukraine by Russia was among the intelligence items discussed in the Situation Room on Thursday night in an emergency meeting, U.S. officials confirmed to CBS News.

That detail was just part of what two U.S. officials described as a broad mosaic of information that has been building since the fall and which has led to the Biden administration's planning for the worst-case scenario of a multi-axis, simultaneous attack on Ukraine by the Russian military. 

The Washington Post was the first to report, on Friday, that a false flag operation was among the data points in the new intelligence.