North Korean leader Kim Jong Un supervised the firing of new air defense missiles to test their combat capability, state media KCNA reported on Sunday.
The report came ahead of the summit on Monday between US President Donald Trump and South Korean President Lee Jae Myung.
Earlier this month, Kim condemned the US-South Korea joint military drills as their intent to remain "most hostile and confrontational" to his country, pledging to speed up nuclear build-up.
The new anti-air weapon systems showed "fast response" to aerial targets such as attack drones and cruise missiles, KCNA said.
Russia also operates in the region
In a similar event, Russia's Pacific Fleet launched cruise and anti-ship missiles during drills in the Sea of Japan that also involved aircraft and drones, the Russian defense ministry said on Thursday.
"Kalibr and Uran missiles were fired by the Marshal Shaposhnikov frigate in the Sea of Japan, and the sailors successfully hit their target," the ministry said.
"The maneuver was carried out by ships and vessels of the Pacific Fleet, as well as the fleet's naval aviation aircraft and drones," it said.