I don't think he has the capability yet. So far his missiles fizzle out and land in the water somewhere. You are correct he is all talk. That is part of his subjugation strategy. He has his people brainwashed into thinking that the US is their enemy and that he is the only thing that stands between them and us is him.I hear the US Constitution doesn't allow the assassination of foreign tyrants.
Pity, because a single bullet is a lot cheaper than sending in a zillion men, planes, tanks and ships..
(PS: but in fairness to Tubby Boy he hasn't committed any hostile act towards America yet, all he's doing is childish name-calling like a spoilt schoolyard brat, so he's not even worth wasting a bullet on)