The Japanese use all modern American equipment on their destroyers. Mark 41 VLS, Mark 46 torpedo, Mark 32 torpedo tubes, Mark 42 naval gun, Phalanx CIWS, Harpoon, SM-2, SM-3, Sea Sparrow and ASROC.
The North Koreans have a few frigates and missile craft from the 1950’s and 60’s. Old Soviet and Chinese designs.