SINGAPORE — The U.S. will not require North Korea to provide a complete list of its nuclear weapons and missile sites before President Donald Trump and the North's leader Kim Jong Un meet for a second time, Vice President Mike Pence told NBC News exclusively on Thursday.

Since an initial agreement for denuclearization on the Korean Peninsula was reached between Trump and Kim in June, the United States has pressed the North Koreans to provide information on the entirety of its nuclear operations. The Kim regime has refused to provide the details of the country’s operations and postponed scheduled meetings with Secretary of State Mike Pompeo in New York City last week.

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40 PHOTOS Scenes from Donald Trump and Kim Jong Un's summit in Singapore See Gallery Scenes from Donald Trump and Kim Jong Un's summit in Singapore North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images) U.S. President Donald Trump walks with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst North Korea's leader Kim Jong Un visits The Marina Bay Sands hotel in Singapore, June 11, 2018. REUTERS/Edgar Su U.S. President Donald Trump flanked by Secretary of State Mike Pompeo and White House Chief of Staff John Kelly attend a lunch with Singapore's Prime Minister Lee Hsien Loong and officials at the Istana in Singapore June 11, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY US President Donald Trump (R) gestures as he meets with North Korea's leader Kim Jong Un (L) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images) Retired American professional basketball player Dennis Rodman speaks to the press as he arrives at Changi International airport ahead of US-North Korea summit in Singapore on June 11, 2018. - North Korea's Kim Jong Un and US President Donald Trump meet on June 12 for an unprecedented summit in an attempt to address the last festering legacy of the Cold War, with the US President calling it a 'one time shot' at peace. (Photo by ADEK BERRY / AFP) (Photo credit should read ADEK BERRY/AFP/Getty Images) The motorcade of U.S. President Donald Trump travels towards Sentosa for his meeting with North Korean leader Kim Jong Un, in Singapore June 12, 2018. REUTERS/Edgar Su TPX IMAGES OF THE DAY Singapore's Foreign Minister Vivian Balakrishnan takes a selfie with North Korea's leader Kim Jong Un during a visit in Merlion Park in Singapore, in this photo taken by Kyodo June 11, 2018. Mandatory credit Kyodo/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN. SINGAPORE - JUNE 11: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'MINISTRY OF COMMUNICATIONS AND INFORMATION, REPUBLIC OF SINGAPORE / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump (L) meets with Singapore's Prime Minister Lee Hsien Loong (R) to attend a bilateral meeting at the Istana, Singapore on June 11, 2018. (Photo by Ministry of Communications and Information, Republic of Singapore / Handout/Anadolu Agency/Getty Images) Kim Jong Un, North Korea's leader, center, tours the Esplanade in Singapore on Monday, June 11, 2018. Kim smiled and waved to a cheering crowd during a surprise late-night tour of Singapore on the eve of his summit with U.S. President Donald Trump. Photographer: SeongJoon Cho/Bloomberg via Getty Images U.S. President Donald Trump shakes hands with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst U.S. President Donald Trump and Singapore's Prime Minister Lee Hsien Loong walk together during a meeting at the Istana in Singapore June 11, 2018. REUTERS/Jonathan Ernst Kim Jong Un, North Korea's leader, center, tours the Esplanade in Singapore on Monday, June 11, 2018. Kim smiled and waved to a cheering crowd during a surprise late-night tour of Singapore on the eve of his summit with U.S. President Donald Trump. Photographer: SeongJoon Cho/Bloomberg via Getty Images U.S. President Donald Trump is pictured during a meeting at the Istana in Singapore June 11, 2018. REUTERS/Jonathan Ernst North Korea's leader Kim Jong Un (L) poses with US President Donald Trump (R) after taking part in a signing ceremony at the end of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Anthony WALLACE / POOL / AFP) (Photo credit should read ANTHONY WALLACE/AFP/Getty Images) US President Donald Trump holds up a document signed by him and North Korea's leader Kim Jong Un following a signing ceremony during their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images) SINGAPORE - 2018/06/11: President Trump leaves the Sinagpore Istana after meeting with with Singaporean PM Lee Heisn Loong ahead of Trump-Kim Summit. The historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un has been scheduled for June 12 in Singapore as both leaders arrived in the Southeast Asian city-state on Sunday ahead of the landmark summit. (Photo by Sion Ang/SOPA Images/LightRocket via Getty Images) North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images) Supreme Leader of North Korea, Kim Jong Un (3rd from left) leaves the Singapore's Gardens by the Bay, Marina Bay Sands on night before summit on June 11, 2018 in Singapore. (Photo by Chris Jung/NurPhoto via Getty Images) North Korea's leader Kim Jong Un (R) walks with US President Donald Trump (L) during a break in talks at their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un became on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Anthony WALLACE / POOL / AFP) (Photo credit should read ANTHONY WALLACE/AFP/Getty Images) SINGAPORE - JUNE 11: North Korean leader Kim Jong-un (C) walks along the Jubilee bridge during a tour of some of the sights on June 11, 2018 in Singapore. The historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un has been scheduled in Singapore for June 12 as a small circle of experts have already been involved in talks towards the landmark summit in the city-state. (Photo by Chris McGrath/Getty Images) People watch a television screen showing live footage of the summit between US President Donald Trump and North Korean leader Kim Jong Un in Singapore, at a railway station in Seoul on June 12, 2018. (Photo by Jung Yeon-je / AFP) (Photo credit should read JUNG YEON-JE/AFP/Getty Images) SINGAPORE - JUNE 11: U.S. Secretary of State Mike Pompeo answers questions at a press briefing June 11, 2018 in Singapore. Pompeo answered a range of questions related primarily to the historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un scheduled for tomorrow June 12 in Singapore. (Photo by Win McNamee/Getty Images) SINGAPORE - JUNE 11: National Security Council press spokesman Robert Palladino (4th R) answers questions from reporters at the White House press filing center June 11, 2018 in Singapore. The historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un has been scheduled for June 12 in Singapore as both leaders arrived in the Southeast Asian city-state on Sunday ahead of the landmark summit. (Photo by Win McNamee/Getty Images) SINGAPORE - JUNE 11: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'MINISTRY OF COMMUNICATIONS AND INFORMATION, REPUBLIC OF SINGAPORE / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump (L6) participates in a working luncheon hosted by Singapore's Prime Minister Lee Hsien Loong at the Istana, Singapore on June 11, 2018. Officials from both delegations also attended the luncheon. (Photo by Ministry of Communications and Information, Republic of Singapore / Handout/Anadolu Agency/Getty Images) SINGAPORE, SINGAPORE - JUNE 11: In this handout provided by the Ministry of Communications and Information of Singapore, U.S. President Donald Trump (R) with Singapore's Prime Minister Lee Hsien Loong (L) on June 11, 2018 in Singapore, Singapore. The historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong-un has been scheduled in Singapore for June 12 as the world awaits for the landmark summit in the Southeast Asian city-state. (Photo by Ministry of Communications and Information Singapore/via Getty Images) US President Donald Trump (R) shakes hands with North Korea's leader Kim Jong Un (L) as they sit down for their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. - Donald Trump and Kim Jong Un have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images) Armed police officers patrol outside JW Marriot South Beach Hotel, a Marriott Group property, in Singapore, on Monday, June 11, 2018. Trumpï¿½met Prime Ministerï¿½Leeï¿½Hsien Loongï¿½at the city-state's presidential palace for more than two hours Monday for discussions that were expected to include everything from summit preparations to the U.S.'s tariff threats. Photographer: SeongJoon Cho/Bloomberg via Getty Images Bodyguards of North Korea's leader Kim Jong Un arrive at The Marina Bay Sands hotel in Singapore, June 11, 2018. REUTERS/Edgar Su TPX IMAGES OF THE DAY Police officers walk around the perimeter of the Capella Hotel on Singapore's resort island of Sentosa, June 11, 2018. REUTERS/Kim Kyung-hoon The motorcade transporting U.S. President Donald Trump leaves the Istana in Singapore June 11, 2018. REUTERS/Tyrone Siu U.S. President Donald Trump and his delegation have lunch with Singapore's Prime Minister Lee Hsien Loong and officials at the Istana in Singapore June 11, 2018. REUTERS/Jonathan Ernst The motorcade of North Korean leader Kim Jong Un travels towards Sentosa for his meeting with U.S. President Donald Trump, in Singapore June 12, 2018. REUTERS/Edgar Su TPX IMAGES OF THE DAY Official cameramen follow the motorcade of North Korean leader Kim Jong Un travels towards Sentosa for his meeting with U.S. President Donald Trump, in Singapore June 12, 2018. REUTERS/Edgar Su The motorcade of U.S. President Donald Trump travels towards Sentosa for his meeting with North Korean leader Kim Jong Un, in Singapore June 12, 2018. REUTERS/Feline Lim TPX IMAGES OF THE DAY Police stand guard outside the Capella Hotel in Singapore, on Tuesday, June 12, 2018. Presidentï¿½Donald Trumpï¿½plans to shake hands and have lunch with North Korean leaderï¿½Kim Jong Un, kicking off a historic summit on Tuesday between two adversaries that only last year had seemed at the brink of nuclear war. Photographer: SeongJoon Cho/Bloomberg via Getty Images People watch a television screen showing live footage of the summit between US President Donald Trump and North Korean leader Kim Jong Un in Singapore, at a railway station in Seoul on June 12, 2018. (Photo by Jung Yeon-je / AFP) (Photo credit should read JUNG YEON-JE/AFP/Getty Images) People watch a television screen showing live footage of the summit between US President Donald Trump and North Korean leader Kim Jong Un in Singapore, at a railway station in Seoul on June 12, 2018. (Photo by Jung Yeon-je / AFP) (Photo credit should read JUNG YEON-JE/AFP/Getty Images) SINGAPORE - JUNE 12: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'MINISTRY OF COMMUNICATIONS AND INFORMATION, REPUBLIC OF SINGAPORE / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump (L) leaves after his meeting with North Korea's leader Kim Jong Un (not seen) as part of the US-North Korea summit in Sentosa island, on June 12, 2018 at Paya Lebar Air Base in Singapore. (Photo by Ministry of Communications and Information, Singapore / Handout/Anadolu Agency/Getty Images) SINGAPORE - JUNE 12: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'MINISTRY OF COMMUNICATIONS AND INFORMATION, REPUBLIC OF SINGAPORE / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump waves his hand as he leaves after his meeting with North Korea's leader Kim Jong Un (not seen) as part of the US-North Korea summit in Sentosa island, on June 12, 2018 at Paya Lebar Air Base in Singapore. (Photo by Ministry of Communications and Information, Singapore / Handout/Anadolu Agency/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

The second Trump-Kim meeting, slated for after the New Year, will be where a "verifiable plan" to disclose the sites and weapons must be reached, Pence said.

"Now we need to see results," he added during a wide-ranging interview that also touched on special counsel Robert Mueller's probe into Russia's alleged meddling and the vice president's conversation with Russian leader Vladimir Putin.

“I think it will be absolutely imperative in this next summit that we come away with a plan for identifying all of the weapons in question, identifying all the development sites, allowing for inspections of the sites and the plan for dismantling nuclear weapons,”

This week, a report from the Center for Strategic and International Studies outlined a number of missile operating bases that the North Koreans have continued to develop since the Trump-Kim summit five months ago.

“We can’t negotiate over things they don’t admit having,” said Victor Cha, one of the authors of the report. “It should take us back to the initial U.S. negotiating point: We need a full declaration.”

Speaking on the sidelines of a meeting of Asian leaders in Singapore, Pence said, "Everything begins with relationships, but now we need to see results.

He added that there had been “tremendous progress” in negotiations thus far — namely North Korea’s stoppage of missile testing and the return of U.S. hostages and the possible remains of American service members in the Korean War.

The U.S. will maintain its hardline pressure on North Korea by not lifting its sanctions, Pence added.

“Until we have a plan that is implemented to achieve complete, verifiable, irreversible, denuclearization, we're going to keep the pressure on,” he said.

Before his interview with NBC News, Pence left a meeting with South Korean President Moon Jae-in, who has called on the U.S. to sign onto a peace treaty that would end the Korean War. The Trump administration has not indicated that it would make that agreement before lifting sanctions on North Korea.

Pence used the Association of Southeast Asian Nations (ASEAN) summit to raise the issue of Russia’s interference in the 2016 U.S. election directly with President Putin, his office said.

The conversation took place during his third interaction with the Russian leader over a 24-hour period. Pence and Putin shared a table at a dinner the night prior but only exchanged “greetings,” Pence said. He stood next to Putin for two minutes at an afternoon session as the Russian president engaged in conversation with National Security Adviser John Bolton.

The vice president also weighed in on special counsel Robert Mueller's probe into Russia's alleged meddling.

"I think the people can be confident that we will continue to cooperate," Pence said when asked if the American public should be concerned about the investigation coming to an end.

Pence added that the administration had sent over a million documents to the special counsel so far. Earlier this month Trump ousted Attorney General Jeff Sessions, who had recused himself from the investigation, and named Matt Whitaker as acting attorney general. Whitaker was previously critical of the Russia investigation, but will now oversee Mueller.

Trump later slammed the special counsel investigation, tweeting it was a "total mess" that has "gone absolutely nuts."

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