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Astronauts Christina Koch and Jessica Meir finished their spacewalk at 1:33 pm US Eastern Time (0633 GMT), which lasted about six hours and 58 minutes, according to the US space agency NASA.

Asked about whether a three-way summit in Singapore would be held between the ROK, the DPRK and the US after the summit on June 12, the official said Seoul had yet to launch preparations for such a meeting.

At noon of Sunday, on the pavement in front of Melia Hotel, which has been believed to receive the DPRK delegation, chairman of Hanoi's People Committee (the municipal government) Nguyen Duc Chung, was seen instructing hotel staff to put up long banners featuring iconic images of Hanoi, and place red flowers on the pavement.

Associated Press Writer David Warren in Dallas contributed to this report.

Astronauts Christina Koch and Jessica Meir finished their spacewalk at 1:33 pm US Eastern Time (0633 GMT), which lasted about six hours and 58 minutes, according to the US space agency NASA.