North Korea's state-run media say leader Kim Jong Un inspected the country's nuclear weapons program on Monday.

The media reported on Tuesday that Kim was briefed by Nuclear Weapons Institute officials on the development of the country's tactical nuclear weapons and the system for managing its nuclear arsenal.

Kim is said to have called for scaling up the production of weapons-grade nuclear materials to exponentially increase the country's arsenal.

The media also reported North Korea launched two ground-to-ground tactical ballistic missiles in a drill on Monday. It said the missiles were fired from Pyongyang toward an island in the country's northeast.

South Korea's military has said the North launched two short-range ballistic missiles near Pyongyang on Monday morning.