North Korean leader Kim Jong Un supervised the firing of new air defence 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 Korea 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.
Trump vows to blockade Strait of Hormuz after Iran peace talks stumble
Nigerian airstrike hits market, 200 feared dead
Russia, Ukraine trade accusations of ceasefire violations
At least 30 dead in stampede at Haiti’s historic Laferriere Citadel
Cyclone lashes New Zealand's North Island, hundreds evacuated
