North Korea's state media has kept mum toward Kim's planned summit with Trump, and a separate meeting between Kim and South Korean President Moon Jae-in slated for late April.
"The announcement of a meeting between President Trump and North Korean leader Kim is a historic opportunity that holds great potential for the world", Haley said. He says it's "very important that those conservations are held quietly" between North Korea and the U.S.
Trump said he would meet with Kim by May to achieve "permanent denuclearization".
North Korea could also be delaying its response to prepare the political battlespace by creating distance between the USA and its allies and ensuring Pyongyang's long list of grievances is on the table before talks begin.
"Most of that is an inter-administration, interagency process and I'm not going to get ahead of any of the details of the where, the when, or any of that here today", she said, responding to a series of questions on the meeting between the two leaders.
"I think it shows the effectiveness of the maximum pressure campaign, and that's one of the reasons that we're not letting up on the maximum pressure campaign, and we're going to continue pushing forward on it", Sanders said. That's beyond the North's promise not to resume nuclear testing and missile flights or publicly criticize U.S. He noted in a tweet that North Korea has refrained from such tests since November and said Kim "has promised not to do so through our meetings". The decision drew both support from countries seeking to defuse tensions between North Korea and the US, and warnings that Kim could be seeking more time to develop his weapons and reduce pressure from worldwide sanctions.
Meanwhile, in New York, US' National Security Advisor HR McMaster and US Ambassador to the UN, Nikki Haley, briefed members of the UN Security Council on developments related to North Korea.
Tillerson spoke Monday at a news conference in Nigeria. Ironically, South Korea was not a signatory.
Japanese Foreign Minister Taro Kono said after talks with Suh Hoon that Tokyo and Seoul agreed that maximum pressure must be maintained on North Korea until it takes concrete action to address concerns about its weapons programmes. For instance, United Nations special rapporteur on human rights for North Korea Ojea Quintana said on Monday that Pyongyang should "consolidate" its diplomatic rapprochement with South Korea and the world community by creating a "parallel opening to human rights review".
A summit between two nations that have remained in a state of war since the Korean War would be a remarkable turnabout after a year of heightened tensions.