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.
Omani navy rescues cargo ship crew after missile strike
UN 'deeply disturbed' by strike on Iran school that killed 160 children
Saudi confirms attempted attack on oil refinery, no damage
At least four killed in Israeli strike on building in Lebanon's Baalbek
Kuwait announces death of child from shrapnel wound
