South Korea halted the propaganda broadcasts it blares across the border with North Korea yesterday, aiming to set a positive tone ahead of the first summit in a decade between their leaders as the US president cautioned the nuclear crisis was far from resolved.

The gesture came after North said it would immediately suspend nuclear and missile tests, scrap its nuclear test site and instead pursue economic growth and peace, a declaration welcomed by world leaders.

North’s leader Kim Jong Un is due to hold a summit with South Korean President Moon Jae-In at the border truce village of Panmunjom on Friday, and is expected to meet with Trump in late May or early June.

"North Korea's decision to freeze its nuclear programme is a significant decision for the complete denuclearisation of the Korean peninsula," South Korean President Moon Jae-in said in a  meeting.

"It is a green light that raises the chances of positive outcomes at the North's summits with South Korea and the United States. If North Korea goes the path of complete denuclearisation starting from this, then a bright future for North Korea can be guaranteed."

South Korea's propaganda broadcasts, which include a mix of news, Korean pop songs, an criticism of the North Korean regime, were stopped at midnight, the defence ministry in Seoul said. It didn't specify if they would resume after the Kim-Moon summit.

"We hope this decision will lead both Koreas to stop mutual criticism and propaganda against each other and also contribute in creating peace and a new beginning," the defence ministry said.

It marks the first time in more than two years that the South's broadcasts have fallen silent. North Korea has its own propaganda loudspeakers at the border, but a defence ministry official said he could not verify that they had also stopped.