does north korea have a fleet of ships?

They have around 50 missile launching ships, mostly soviet made OSA class and also coastal launchers in unknown amounts.

Of course they do! And oars for each of them!

Didn't a NK sub sink a NATO ship right in the middle of the NATO war games a few years ago??

Who knows what they have in all those deep underground installations...

I think they sunk a SK fishing boat...

The Nork navy is only a moderate threat and that being their subs. Their surface fleet would be some of the easiest targets to take out. One of their subs might get lucky and stumble in front of a US ship. The idea of their subs hunting the US navy is a joke. Luck would be all they'd have.

Land based missiles represent a clear threat. That is why we would see days worth of cruise missile and land based air strikes before a US carrier would come within striking range. The admirals would want to see an 80-90% threat reduction before risking the flattops.