In fairness to Marx, he would've considered a "Marxist state" nonsense. The end game of Marxism is for the state to dissolve. North Korea is more accurately described as a Stalinist dictatorship (which is a more accurate description of most states called "Marxist" or "communist").
Also, I hope the US continues its policy of humoring the little dickhead. One more dead soldier for that little piece of shit country is too much.