She said before the United States would engage in serious talks with North Korea, Pyongyang would have to end its missile tests "for a significant amount of time" and be willing to discuss ending its use of nuclear weapons.
South Korea said it will announce on Tuesday whether it will respect an agreement between the country's previous government and Japan that was aimed at resolving a feud over "comfort women" forced to work in Japan's wartime brothels.
"You have to have a certain attitude and you have to be prepared to do certain things and I'm totally prepared to do that", Trump said, contending his tough words have helped persuade the North to sit down with the South.
"After North Korean leader Kim Jong-un proactively expressed his willingness [to improve inter-Korean relations] in his New Year's address, the two sides have been playing ball with each other", said Kim Yong-hyeon.
He says North Korea's Kim Jong Un - who's threatened the US with a nuclear attack - "knows I'm not messing around, not even a little bit, not even 1 percent". The two Koreas have had little interaction in sporting events after inter-Korean relations deteriorated in 2008. Experts also say that North and South Korea carried out smooth coordination for the rank of the figures appointed to the negotiating teams.
Top officials from North and South Korea will hold their first official dialogue in more than two years on Tuesday after months of high tensions over Pyongyang's weapons ambitions.
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.
South Korean soldiers stand guard before North Korea's Panmon Hall (rear C) and the military demarcation line separating North and South Korea, at Panmunjom, in the Joint Security Area (JSA) of the Demilitarized Zone (DMZ).More news: It's So Cold in the US Temperatures Will Set New Historic Lows
"Look, right now they're talking Olympics".
Moon's government wants to resume temporary reunions of families separated by war and work out measures to reduce threats in frontline areas.
"This is a very risky situation", Haley told ABC News on Sunday. -South Korean military exercises that it calls a rehearsal for an invasion.
The size and membership of the North Korean delegation and their accommodation - widely expected to be paid for by Seoul - will also be discussed. But Defense Secretary Jim Mattis has insisted the delay is a practical necessity to accommodate the Olympics, not a political gesture.
A veteran negotiator in inter-Korean affairs, he has participated in talks with North Korea since the 1990s, including their last summit in 2007.
An agreement by South Korea to revive a jointly run industrial park or a tourism project could also draw criticism from overseas that it violates United Nations sanctions because they would result in South Korean money being sent to North Korea, critics say.
The article was published to mark the high-level meeting to be held on January 9 between representatives of North and South Korea, who have technically been at war for more than 65 years, Efe news agency reported.