Trump withdrew from the nuclear deal in May to the dismay of European allies, Russian Federation and China which had invested years in negotiations to achieve a milestone agreement on keeping Iran's nuclear ambitions in check. Pompeo will visit Pyongyang again next month to prepare for a second summit.
The five remaining parties to the 2015 accord - France, Britain, Germany, China and Russian Federation - agreed during a meeting in NY late Monday to set up a payment system to preserve business ties with Iran despite USA sanctions.
"And until that happens we will continue to exert what the president has called maximum pressure", he said.
His visit to Pyongyang next month will be his fourth this year.
Shin Se-min reports. Speaking to Fox News, President Moon Jae-in discussed the outcomes of diplomacy with North Korea.
But the populist leader was comparatively subdued a year after he stunned the global body with his bellicose language on North Korea, including a threat to "totally destroy" Kim Jong-un's state.
Trump used his UN address previous year to bash the nuclear deal as "an embarrassment", signaling that the United States was ready to walk away from the agreement.
Trump also claimed, without evidence, that Barack Obama had been on the point of going to war with North Korea in the last weeks of his presidency and that Trump's election had saved the world from calamity. "We believe that when nations respect the rights of their neighbors, and defend the interests of their people, they can better work together to secure the blessings of safety, prosperity, and peace".
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The administration should delink peace and denuclearization so both are more likely.
The incident took place during Trump's speech to the annual UN General Assembly.
"But the latest denuclearization agreement was reached by the USA president and North Korea's highest leader in a direct summit for the first time in history, and was promised to the entire world".
Since then, however, the administration has said there has been positive correspondence with the North Koreans.
He dismissed such concerns, saying a declaration would only be a political or symbolic gesture aimed at providing some security assurances to the North, which agreed to give up its nuclear weapons in exchange for security guarantees from the U.S.
Moon also said while it was "natural" to be suspicious of North Korea's true intentions, the situation is "completely different" this time largely due to its leader's eagerness to transform the impoverished country into an economic powerhouse.
"Iran's leaders sow chaos, death and destruction", Trump said.
"I think we will make a deal", he said. "We are standing up for America and the American people, and we are also standing up for the world", he said.