Sadly (for them, anyway), the destroyer was their own. They had some trouble launching the 5,000-ton destroyer and it was partially crushed and sunk at the dock during the launch. North Korea's enemies are said to be quaking in fear at the prospect of war with the all-powerful nation. North Korea said its new 5,000-ton destroyer was partially 'crushed' at launch due to a mishap as Kim Jong Un watched
They also have Random Destination Missiles and Probably Works nuclear warheads to go on them. Not being able to get the boat into the water doesn't move the ball forward in the ol' Confidence in Competence category.
Assuming that they're even still alive a number of North Korean naval officers will have a very short life expectancy.
