Geneva: North Korea will join international efforts to ban nuclear tests, its ambassador to the United Nations in Geneva, Han Tae Song, told the Conference on Disarmament on Tuesday.

North Korea, which is believed to have tested six nuclear weapons, has said it will dismantle its only known nuclear test site this month ahead of a meeting on June 12 between US President Donald Trump and North Korean Leader Kim Jong-un.

It comes as a satellite photo appeared to back up North Korea's claim, showing that buildings have already been dismantled at the country's only test site.

"Discontinuation of nuclear tests and follow up measures are an important process for global disarmament and DPRK will join international disarmament efforts for a total ban on nuclear tests," Han told the disarmament forum, using his country's official name, the Democratic People's Republic of Korea.

Han did not explicitly mention the Comprehensive nuclear Test-Ban Treaty aimed at introducing that total ban.