Trump says 'not happy' about latest North Korea missile test

US President Donald Trump on Sunday said he was "not happy" about North Korea's latest missile test but played down the seriousness of the incident.

"I'm not happy about it but then again he's not in violation of the agreement," Trump told reporters on the sidelines of the G7 summit after North Korea's Kim Jong Un supervised the test-firing of a "super-large multiple rocket launcher".

Trump has staked enormous political capital on personal diplomacy with Kim in a so-far unsuccessful effort to persuade the dictator to give up his nuclear weapons arsenal.