North Korea's foreign ministry said on Thursday it had stopped testing missiles and conducting nuclear tests "followed by dismantling the nuclear test ground", and yet the United States still had insisted on "denuclearisation first".
North Korea has lashed out at the United States for continuing to push for sanctions enforcement.
The White House and US State Department did not immediately respond to requests for comment.
Ri arrived in Tehran on the same day as the United States reimposed sanctions after abandoning a 2015 nuclear deal between major powers and Iran.
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"They have to understand that the worldwide community still expects them to denuclearize and so we're willing to wait if they want to wait, but we're not willing to wait for too long", said Haley, who has pushed through three United Nations sanctions packages since arriving at the world body 18 months ago.
"As long as the United States denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the joint statement including the denuclearisation", North Korea's foreign ministry said on Thursday.
"The firms appear to have illicitly brought it in expecting big trading margins after prices of North Korean coal had dropped due to the import ban", Roh Suk-hwan, deputy commissioner of the Korea Customs Service, told a news conference.
"In the current situation, friendly countries should develop their relations and cooperation in (the) global community", he said, adding Iran and North Korea have "always had close views" on many issues.
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Those American officials are "going against the intention of President Trump to advance the DPRK-U.S. relations, who is expressing gratitude to our goodwill measures for implementing the DPRK-U.S. joint statement", it said referring to the North by its official name, the Democratic People's Republic of Korea.
"As long as the U.S. denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the DPRK-U.S. joint statement including the denuclearization", it said.
Donald Trump met North Korean Kim Jong-un for the first time in June. Last month, Washington warned against loosening sanctions on Pyongyang after Russian Federation and China suggested discussing such a move.
The North noted that they returned remains of US soldiers who fought in the Korean War to the USA last week.
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