North Korea has produced a nuclear warhead capable of being fitted onto smaller short-range missiles targeting South Korean and U.S. forces on the Korean Peninsula, according to a state media report Tuesday on leader Kim Jong Un inspecting the warheads.

Kim reportedly called for expanding production of nuclear material in order to manufacture more weapons, as photos showed him next to a warhead named “Hwasan-31” and diagrams of the warhead inside various missiles during the inspection the previous day.