North Korean leader Kim Jong Un guided a series of tactical nuclear missile tests to simulate attacks against South Korea in recent weeks, state media reported Monday, releasing the first images and details of seven recent missile tests as well as air force and artillery drills.

Kim guided the missile tests — including of a submarine-launched ballistic missile (SLBM) and “new” intermediate-range ballistic missile (IRBM) — as a warning and response to joint U.S.-ROK military drills, the Rodong Sinmun reported.