North Korean leader Kim leaves by train for summit with U.S. in Hanoi - KCNA

By Joyce Lee

SEOUL (Reuters) - North Korea confirmed leader Kim Jong Un's second summit with U.S. President Donald Trump for the first time on Sunday, days ahead of the high-stakes nuclear meeting set to take place in Vietnam's capital, Hanoi.

Kim left Pyongyang by train on Saturday afternoon for the Feb. 27-28 summit accompanied by senior North Korean officials, North Korea's official KCNA news agency said.

The delegation with Kim includes top North Korean officials who took part in last year's expanded summit talks between Kim and Trump in Singapore, including top envoy to the U.S. Kim Yong Chol, vice chairman of the central committee of North Korea's Worker's Party Ri Su Yong, and foreign minister Ri Yong Ho.

The North Korean leader's sister Kim Yo Jong, who was also seen aiding him in Singapore, is travelling with Kim as well.

Other senior North Korean officials, such as his de facto chief of staff Kim Chang Son and Kim Hyok Chol, negotiations counterpart to U.S. envoy Stephen Biegun, were already in Hanoi to prepare for the summit.

Kim will also make an official goodwill visit to Vietnam "soon," KCNA said.

Vietnam's foreign ministry announced on Saturday that Kim will make an official visit to Vietnam in the "coming days" at the invitation of Nguyen Phu Trong, the president and general secretary of the Southeast Asian nation's ruling Communist Party.

Trump and Kim will meet in Hanoi eight months after their historic summit in Singapore - the first between a sitting U.S. president and a North Korean leader - at which they pledged to work toward the complete denuclearisation of the Korean peninsula.

But scant progress since then has driven the two leaders to again seek a top-down approach to diplomacy, analysts said.

"They will not make an agreement which breaks up the current flow of diplomacy. (President Trump) has mentioned that they'll meet again; even if there is a low-level agreement, they will seek to keep things moving," said Shin Beom-chul, a senior fellow at the Asan Institute for Policy Studies.

The Trump administration has pressed North Korea to give up its nuclear weapons programme, which threatens the United States, before it can expect any concessions.

North Korea wants an easing of punishing U.S.-led sanctions, security guarantees and a formal end of the 1950-1953 Korean War, which ended in a truce, not a treaty.

Both sides are under pressure to forge more specific agreements than were reached at the Singapore summit, which critics - especially in the United States - said lacked detail.

If Kim travels all the way to Vietnam by train it could take him at least two and a half days to make the journey of thousands of kilometres through China.

On Feb. 26, Vietnam will ban traffic on the road Kim is expected to take to Hanoi from a station on the Chinese border, state media said.

Travel by train has been a favourite mode of transport for Kim Jong Un, as it was for his father, Kim Jong Il, and grandfather, Kim Il Sung.

When Kim Il Sung visited Hanoi in 1958, he travelled from Pyongyang to Beijing by train, then flew to Hanoi in a plane provided by China, South Korea's Yonhap News Agency reported on Saturday citing archived Chinese media reports.

(Reporting by Joyce Lee; Editing by Daniel Wallis)