The unfortunate thing is that Putin has signaled that he's willing to use tactical nukes in a regional conflict, and the U.S. is signaling back that they're wil

The unfortunate thing is that Putin has signaled that he's willing to use tactical nukes in a regional conflict, and the U.S. is signaling back that they're willing to do the same. A tac nuke detonated anywhere would be a globally destabilizing event, and a regional nuclear war would be a catastrophe.