Two South Korean envoys left for Washington Thursday to brief US officials on their landmark visit to Pyongyang and the North's offer to talk about giving up its nuclear arsenal.

Chung Eui-yong, head of Seoul's National Security Office, will meet top US officials including National Security Advisor HR McMaster and Secretary of State Rex Tillerson, Yonhap news agency said.

"We have a separate message from North Korea for the US," Chung told journalists after revealing details of his meeting with the North's leader Kim Jong Un.

In a surprising turnaround, Kim said — as relayed by Seoul — that the North wanted to talk to the US and would not need nuclear weapons if the country's security was guaranteed.

The two Koreas also agreed to hold a third inter-Korean summit in late April at the southern side of the border truce village of Panmunjom.

Chung was accompanied Thursday by Suh Hoon, the chief of South Korea's spy agency, the National Intelligence Service, who was also part of the delegation to Pyongyang.

After Washington, Chung will later visit China and Russia to brief officials, while Suh will travel to Japan.

The three countries, along with the US, are involved in six-party talks on ending North Korea's nuclear drive which have stalled since 2008.

US President Donald Trump welcomed this week's developments as "very positive" and said the North's talks offer appeared to be "sincere", adding: "We'll soon find out."

The Dong-A Ilbo newspaper quoted an unidentified senior official of the presidential Blue House saying that Kim had not made any specific "give-and-take style" demands concerning dialogue with the US.

"He is apparently drawing a big picture," the official was quoted as saying.

"Kim has expressed his willingness to make his country a normal state" instead of a pariah state under sanctions, he added.

Analyst Cheong Seong-chang of the Sejong Institute said the landmark visit to Pyongyang had provided "key momentum" to contain the North's nuclear and missile threats, prevent conflict on the Korean peninsula and and start building trust.

"However, the path toward denuclearisation will be very rough," he said, forecasting that the North would continue missile production this year even if it stops nuclear and rocket tests.

And he added: "Even if an agreement is reached on freezing the North's nuclear programmes, complete verification would be next to impossible."

China urges US, N.Korea to hold talks 'sooner than later'
Beijing (AFP) March 8, 2018 –

China's foreign minister urged the United States and North Korea Thursday to start talks as soon as possible, stressing that "the sincerity" of all parties to solve the nuclear crisis would be tested.

Foreign Minister Wang Yi cautiously welcomed Seoul's announcement that Pyongyang had offered to hold denuclearisation talks with the United States in return for security guarantees.

The North also agreed to hold a historic summit between its leader Kim Jong Un and South Korean President Moon Jae-in in late April.

"The Korean peninsula issue has finally taken an important step in the right direction," Wang told a press conference on the sidelines of annual parliamentary session.

"These initial steps must be followed up by corresponding and concerted efforts by the parties. We call on the parties, particularly the United States and the DPRK, to engage in dialogue sooner rather than later," he said.

But Wang issued a word of caution, noting that breakthroughs on the North Korean nuclear issue had collapsed in the past.

"Of course it takes more than one cold day to freeze three feet of ice," he said.

"Despite light at the end of the tunnel, the journey ahead won't be smooth. History has reminded us time and again that whenever tensions subsided on the peninsula the situation would be clouded by various interferences," he said.

"Now is the crucial moment to test the sincerity of the parties to solve the nuclear issue."

Wang's comments come as two South Korean envoys left for Washington to brief US officials on the North's offer, after their landmark visit to meet Kim in Pyongyang.

According to Seoul, Kim said the North wanted to talk to the US and would not need nuclear weapons if the country's security was guaranteed.

Envoy Chung Eui-yong, head of Seoul's National Security Office, will travel to China and Russia following his Washington trip.

– Breakthrough or ploy? –

Wang said the security concerns of North Korea must be addressed in return for progress towards denuclearisation.

Under pressure from US President Donald Trump, Beijing has backed a series of United Nations sanctions against North Korea, sending relations between the Cold War-era allies to a new low.

Beijing has repeatedly called for negotiations to peacefully put an end to tensions that have raised fears of nuclear warfare, after months of fiery rhetoric between Kim and Trump.

Wang said China's proposal for the United States, Japan and South Korea to suspend joint military drills in the region in return for North Korea halting its nuclear and missile tests was "the right prescription".

In Tokyo, which has seen North Korea test ballistic missiles over its airspace, Japanese Prime Minister Shinzo Abe warned that North Korea's offer of denuclearisation talks with Washington could be a ploy to play for time.

"I've repeatedly said that we have to create a situation of putting maximum pressure on North Korea so that the North wants to have talks with us," Abe told MPs.

"However… it is true that the North has in the past earned time to develop nuclear capabilities and missiles" during periods of negotiation, Abe cautioned.

"Talks for the sake of talks are meaningless and we should never loosen sanctions just because North Korea is open to talks."