U.S. Secretary of State Mike Pompeo will hold a meeting with a visiting senior official from the Democratic People's Republic of Korea (DPRK) in NY on Thursday, the U.S. State Department said on Monday.
"We think it's going fine".
"But I will say this, I will say this very simply - We are in no rush, the sanctions are on", he said. "The sanctions are on".
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The State Department previously announced that the meeting agenda would be focused on making progress on the four points of the Singapore summit agreement, including "achieving the final, fully verified denuclearization" of North Korea.
A tougher United States stance on North Korea could complicate South Korea's efforts to improve relations with North Korea and expand cross-border exchanges in line with progress on the denuclearization of North Korea.
Pompeo will meet with Kim Yong Chol, vice chairman of the ruling Workers' Party of Korea (WPK) Central Committee.
In a statement, it added, "Ongoing conversations continue to take place", but did not elaborate.
Kim also help a summit with U.S. President Donald Trump in Singapore in June, when he was cited by North Korean media as expressing his admiration for Singapore's economic development.
North Korea's foreign ministry has warned that Pyongyang will "seriously" consider reviving its nuclear weapons program unless United States sanctions are lifted.
The State Department said the meeting would take place at an unspecified later date, "when our respective schedules permit". South Korea's foreign ministry said it was not aware of Ri's visit.
Woo Jung-yeop, a research fellow at the Sejong Institute, noted that the US House could call in US diplomats for hearings, investigate Trump's North Korea policies and demand more details about the Trump administration's negotiations with the North.
FILE - Journalists look around the third tunnel of Punggye-ri nuclear test ground before it is blown up during the dismantlement process in Punggye-ri, North Hamgyong Province, North Korea, May 24, 2018.
North Korea has for years pursued nuclear and missile programs in defiance of U.N. Security Council resolutions but the bellicose rhetoric from both Pyongyang and Trump that raised fears of war has eased this year.