‘Too early to be optimistic’ on North Korea, says South’s president Moon Jae-in 

South Korean President Moon Jae-in sounded a note of caution Wednesday over the North’s offer of denuclearisation talks, saying it was "too early to be optimistic", even as US leader Donald Trump welcomed the development.

President Trump welcomed Pyongyang’s breakthrough declaration – as relayed by Seoul – that it wanted to talk to the US and would not need nuclear weapons if its security was guaranteed as positive and apparently sincere.

It followed months of tensions, threats and personal insults between him and the North’s leader Kim Jong Un, before the Winter Olympics in the South triggered a flurry of diplomacy.

Moon and Kim will sit down for a summit on the southern side of the Demilitarized Zone next month, Seoul said after its envoys returned from a historic trip to Pyongyang.

Kim said the North would halt provocative missile and nuclear tests while talks are under way, it added.

But Moon told party leaders: "We are only at the starting line and it’s too early to be optimistic."

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"Inter-Korean talks won’t be enough to achieve peace," he said, stressing the importance of Seoul maintaining close co-operation with its security guarantor Washington and adding there would be no let-up in sanctions or pressure purely as a result of inter-Korean dialogue.

There have been two previous inter-Korean summits, in 2000 and 2007, both of them in Pyongyang – although it later emerged the North had been paid $500 million ahead of the first meeting, prompting critics to denounce it as a bribe.

Moon denied there had been any behind-the-scenes agreement with Pyongyang in return for it coming to the negotiating table, adding: "There will be no such a thing as a gift to the North."

Past talks and deals with the North had failed to result in its denuclearisation, he pointed out, after defence minister Itsunori Onodera told reporters: "We still don’t know clearly North Korea’s intention."