North Korea's recent abrupt push to improve ties with South Korea wasn't totally unexpected, as the country has a history of launching provocations and then pursuing dialogue with rivals Seoul and Washington in an attempt to win concessions.
In a New Year's Day speech, North Korea's young leader, Kim Jong Un, said he was willing to send a delegation to next month's Winter Olympics in South Korea, while also announcing he has a "nuclear button" on his desk that could launch an atomic bomb at any location in the mainland United States.
Seoul responded with an offer of talks, and earlier this week the hotline between the neighbors was restored after being suspended for nearly two years.
"The Olympics is a celebration of peace". South Korea may suggest that North and South Korean athletes parade together during the opening and closing ceremonies and field a joint women's ice hockey team.
According to reports, Bach is scheduled to meet Chang Ung, a member of the North Korean Olympic body at the IOC headquarters in Lausanne to discuss North Korea's possible participation in the games.
This is an apparent reference to increased criticism by the conservative South Korean opposition, which argues that financing the North's athletes in PyeongChang could violate global sanctions imposed on the Kim Jong-un regime for its weapons programme.
The North's delegation will be led by Ri Son Gwon, the head of the Committee for the Peaceful Reunification of Korea.
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This photo, taken January 8, 2018, shows Unification Minister Cho Myoung-gyon.
The two Koreas have been separated by the world's most heavily militarized border since the Korean War ended in a stalemate in 1953.
South Korea wants to discuss the resumption of family reunions but Pyongyang snubbed previous offers, saying it will not consider further reunions unless several of its citizens are returned by the South.
Stating with the 2000 Sydney Olympics, the two countries have since made joint entrances at nine major worldwide events.
The United States and South Korea agreed last week to delay the Foal Eagle and Key Resolve exercises until after the Games, apparently to help ease nerves. Beijing and Moscow have both called for them to be suspended.
Haley said it was her understanding that the two sides were limiting their talks to the Olympics, "but you know, those two countries have to get along".
Trump, in a Twitter comment, retorted, "Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!"