The leaders of North and South Korea are due to meet at a summit of the two countries next month.
Seoul's envoy has said this after a rare trip to Pyongyang. North Korea's Kim Jong-un also said he is willing to talk to the US about getting rid of nuclear weapons.
There have been previous programmes to halt the North's nuclear ambitions, but it has failed to keep its promises. It will be the first meeting between the leaders of the two countries for more than a decade.
The two men will meet on the heavily fortified border next month, at the truce village of Panmunjom. The two countries also agreed to open a hotline between the leaders.
On their return from Pyongyang, South Korean officials said Kim Jong-un told them that he is now willing to talk about getting rid of the North's nuclear weapons, if he felt that the regime's security could be guaranteed. Mr Kim also said there would be no missile tests while diplomacy continued.
The United States had said talks with North Korea would only go ahead if it is willing to discuss denuclearisation.
Relations between the two Koreas have warmed following last month's Winter Olympics, which were held in Pyeongchang in the South.
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