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 says US needs to own Greenland to deter Russia, China
Kyiv scrambles to repair ruined power grid after Russian attack
Swiss prosecutors summon owners of ski resort bar after deadly blaze
Death toll in Philippines landfill collapse rises to 4
Australian bushfires raze homes, cut power to tens of thousands
