North Korea said Wednesday it had tested a new multi-purpose missile launching system and a multiple tactical cruise missile weapon system, highlighting Pyongyang's efforts to steadily upgrade its tactical and conventional arsenal.

The tests were overseen by the reclusive nation's leader Kim Jong Un, the state-run Korean Central News Agency (KCNA) said.

They assessed the power of a "special mission warhead" on tactical ballistic missiles, the reliability of long-range multiple-launch artillery rockets the accuracy of AI-guided tactical cruise missiles, KCNA added.

South Korea's military previously reported the tests, saying on Tuesday that the North had fired several projectiles, including a ballistic missile, off its west coast.

Seoul said the missiles flew about 80 kilometers (50 miles).What lessons is North Korea learning from the Iran war?To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video