Russia has threatened to rescind its ratification of the 1996 nuclear test ban aimed at ceasing all nuclear explosions worldwide.
But this is just the latest in a series of moves meant to intimidate Ukraine and its supporters by an increasingly desperate Russia.
Regardless, the resumption of nuclear testing by Russia could prove catastrophic, and move the world closer to an actual nuclear conflict.
Find out in today's epic new video that looks more closely into Putin's threat to see if it has any credibility.