CIA Chief: We Have to Take Putin's Nuclear Weapons Threat 'Seriously'

CIA Director William Burns says it is difficult to determine if Russian President Vladimir Putin is bluffing about his threat to use nuclear weapons in Ukraine.

But Burns added the U.S. has to take the warnings seriously.

Burns made his comments during an interview on "CBS Evening News with Nora O'Donnell."

He was asked if he saw any signs Russia was intending to use nuclear weapons in Ukraine.

"Well, we have to take very seriously his kind of threats given everything that's at stake," Burns said. "And, you know, the...