Biden is letting Ukraine use a powerful new weapon. What happens next?

Russian President Vladimir Putin signed a new version of the country’s nuclear doctrine on Tuesday .

The new doctrine would theoretically make it easier for Russia to use nuclear weapons in this conflict.

On Tuesday , Ukraine attacked a weapons depot about 70 miles from Ukraine 's border.

The move raises the question: Could Russia 's war in Ukraine escalate into a nuclear conflict?.

Russia and the US seem to be responding to each other’ escalations.

Russia put North Korean troops on the battlefield, the US responded by authorizing the use of longer range missiles, and Russia released its new nuclear posture.

That sort of behavior is both reckless and dangerous, Charap said.