North Korea does "not feel any need" to resume talks with Washington, a senior diplomat for the country said Saturday, days after Seoul called for a summit as it seeks improved ties with Pyongyang.

North Korean leader Kim Jong Un has suspended plans for military action against the South, state media reported Wednesday, in an apparent sudden dialling down of tensions after Pyongyang blew up a liaison office.

North Korea threatened Wednesday to bolster its military presence in and near the Demilitarized Zone, a day after blowing up its liaison office with the South, prompting sharp criticism from Seoul.

North Korea condemned the South Friday for holding military drills, saying the situation was returning to before the diplomatic rapprochement of 2018, as leader Kim Jong Un -- whose health was the subject of intense speculation in recent weeks -- reached out to traditional ally Beijing.

North Korea's Kim Jong Un has made his first public appearance in nearly three weeks, state media reported Saturday, following intense speculation that the leader of the nuclear-armed nation was seriously ill or possibly dead.

Nuclear-armed North Korea successfully tested "super-large multiple rocket launchers", state media said on Monday, but leader Kim Jong Un was not described as commanding the drill as analysts say Pyongyang seeks to normalise its launches.

North Korea fired what appeared to be two short-range ballistic missiles off its east coast on Saturday, the latest in a series of such launches by Pyongyang as the world struggles with the coronavirus pandemic.

North Korean leader Kim Jong Un has overseen another "long-range artillery" drill, state media reported on Tuesday, a day after Japan said the nuclear-armed country had fired what appeared to be ballistic missiles.

North Korea fired two unidentified projectiles on Monday, the South's military said, weeks after Pyongyang declared its moratorium on long-range missile tests over.

North Korea said Saturday it had received Donald Trump's letter wishing a happy birthday to leader Kim Jong Un, but warned it will return to nuclear talks only when Washington fully accepts its demands.

The US president and Kim have held three meetings since June 2018 but negotiations have been largely deadlocked since the breakup of their Hanoi summit last February.