New Zealand's government says it will help fund the United Nations nuclear watchdog's efforts to monitor North Korea.

Foreign Affairs Minister Winston Peters on Monday announced that after a phone call with his South Korean counterpart, Kang Kyung-wha, New Zealand had agreed to chip in $NZ200,000 (AUS$184,000) towards the International Atomic Energy Agency.

"Peace on the Korean Peninsula cannot be achieved without complete, verifiable and irreversible denuclearisation," Mr Peters said.

"We want to make an early contribution to assist the IAEA in its current monitoring efforts and further hope that its inspectors are soon able to return to North Korea."

North Korea announced it will be dismantling its nuclear bomb test site later this month ahead of a North Korea-US summit in Singapore scheduled for June 12.

Mr Peters visited the hermit kingdom in 2007 in a bid to strike an aid-for-denuclearisation deal.