US President Donald Trump has declared North Korea no longer poses a nuclear threat, even though there is no clearer definition of denuclearisation or a timeframe added for it to be done.

In North Korea, the state media has praised the summit between Kim Jong-un and Donald Trump as a resounding success, while downplaying the agreement to work toward complete denuclearisation of the Korean Peninsula.

The summit, the first between a sitting US president and a North Korean leader, contrasted to North Korean nuclear and missile tests and exchanges of insults between Trump and Kim last year that fuelled worries about war.