North Korea tested two short-range missile systems on Thursday to simulate nuclear attacks on U.S. and South Korean forces and counter the allies’ joint military drills, according to state media on Friday.

The Korean Central News Agency (KCNA) said leader Kim Jong Un oversaw test firings of the 600mm multiple-launch rocket system (MLRS) and Hwasong-11A short-range ballistic missile (SRBM) from the east coast, a day after the South Korean military detected and reported the launches in real time.

The test targeted various “enemy” positions and aimed to familiarize nuclear missile units with the “national nuclear weapons integrated management system,” state