U.S. President Joe Biden said the U.S. is trying to find an "off-ramp” for Russian President Vladimir Putin and worries his threats to use tactical nuclear weapons are real and could lead to "Armageddon.”

"We’re trying to figure out what is Putin’s off-ramp? Where does he get off? Where does he find a way out?” Biden said Thursday at a fundraiser in New York City. "Where does he find himself in a position that he does not, not only lose face but lose significant power in Russia?”

"He is not joking when he talks about potential use of tactical nuclear weapons or biological and chemical weapons, because his military is, you might say, significantly underperforming,” Biden added. "I don’t think there’s any such thing as the ability to easily use tactical nuclear weapons and not end up with Armageddon.”