NKorea 'in talks to free US detainees' as diplomacy escalates

North Korea is in talks with the US and Sweden to release three Americans held in the North, reports said, as diplomatic activities gathered pace ahead of Pyongyang's planned summits with Washington and Seoul.

The release of the three Korean-Americans -- all held in the North after being separately charged with unspecified "hostile acts" against the regime -- is under discussion through multiple channels almost two weeks after President Donald Trump agreed to meet the North's Kim Jong Un, reports said.

While Pyongyang has yet to confirm it even made the summit offer -- relayed by Seoul envoys who had met Kim in Pyongyang -- the stunning announcement has triggered a race to set a credible agenda for what would be historic talks between the two leaders.

Seoul-based MBC TV station reported Sunday that Pyongyang and Washington had "practically reached" a final agreement on the release of Kim Hak-song, Kim Sang-duk and Kim Dong-chul.

"They are hammering out details over the timing of the release," it quoted an unnamed South Korean diplomatic source as saying.

The negotiation was held through the North's mission to the United Nations and the US State Department -- an unofficial avenue of communication dubbed the "New York channel," the source said.

CNN said the prisoners' release was also discussed at three-day talks in Stockholm between the North's Foreign Minister Ri Yong-Ho and Swedish counterpart Margot Wallstrom that ended Saturday.

Sweden represents Washington's interests in talks with the North. It raised the issue of American detainees to "move things in the right direction," CNN quoted one source as saying.

"Any movement on the issue of these detainees would be a huge deal for the US," said the source.

Kim Dong-chul, a South Korea-born American pastor, has been detained by the North since 2015 when he was arrested for spying. He was sentenced to 10 years of hard labour in 2016.

Kim Hak-song and Kim Sang-duk -- or Tony Kim -- were both working at the Pyongyang University of Science and Technology, founded by evangelical Christians from overseas, when they were detained last year on suspicion of "hostile acts."