I don't know why he is saying this publicly, but the US should ABSOLUTELY be arranging... unfortate accidents... for our foreign enemies around the world. It's too late to do anything about Vladmir Putin. But his potential successors having, you know, bad accidents on those icy Russian roads, would be a good start.
I mean we factuall do do stuff like this, to one degree or another, to various parties (and unequally). But the US would be foolish to take an active role in making sure the truly dangerous people don't live long, productive lives.