Seriously? There is no question to who can beat how. North Korea's navy would definitely lose to the US's. They're ships are worse than ours in the 1960's!!! They have more ships than use, but the ships they do have suck. We would easily wipe out all of North Korea''s air force, establishing a blockade. We could assassinate all of North Korea's leaders, and already china is detaching bond to North Korea. And, if worse comes to worse, we have more nukes than them.