South Korea on Thursday asked a visiting senior U.S. envoy to try to revive stalled nuclear diplomacy with North Korea, which has refused to resume talks because of what it calls hostile U.S. policies.

U.S. Deputy Secretary of State Stephen Biegun, the top U.S. official on North Korea, has been in Seoul for talks since Tuesday. He was to travel on to Japan later Thursday.

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Protesters wearing face masks hold banners as police officers stand guard during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. (AP PhotoLee Jin-man)

South Korea on Thursday asked a visiting senior U.S. envoy to try to revive stalled nuclear diplomacy with North Korea, which has refused to resume talks because of what it calls hostile U.S. policies.

U.S. Deputy Secretary of State Stephen Biegun, center, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

Suh appraised Biegun’s efforts to restart the U.S.-North Korean diplomacy and asked him to continue those efforts, the statement said.

U.S. Deputy Secretary of State Stephen Biegun, right, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

The nuclear diplomacy has yielded little progress since the breakdown of a second summit between Kim and President Donald Trump in early 2019. South Korea’s liberal government, which earlier facilitated the early parts of the nuclear diplomacy, has said it’ll push for the talks’ resumption to achieve a lasting peace on the Korean Peninsula.

U.S. Deputy Secretary of State Stephen Biegun, center left, walks with his South Korean counterpart Lee Do-hoon, center right, after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center left, walks with his South Korean counterpart Lee Do-hoon, center right, after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun speaks during a news briefing after meeting with South Korea's First Vice Foreign Minister Cho Sei-young at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun speaks during a news briefing after meeting with South Korea's First Vice Foreign Minister Cho Sei-young at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center, and South Korea's First Vice Foreign Minister Cho Sei-young, right, leave after news briefing at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center, and South Korea's First Vice Foreign Minister Cho Sei-young, right, leave after news briefing at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, rear left, and South Korea's First Vice Foreign Minister Cho Sei-young, rear right, attend a news briefing after their meeting at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, rear left, and South Korea's First Vice Foreign Minister Cho Sei-young, rear right, attend a news briefing after their meeting at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

A protester wearing a face mask shouts slogan during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. The letters read "Lift sanctions on North Korea."(AP PhotoLee Jin-man)

A protester wearing a face mask shouts slogan during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. The letters read "Lift sanctions on North Korea."(AP PhotoLee Jin-man)

During a meeting with South Korea’s newly appointed presidential national security adviser, Suh Hoon, Biegun stressed the important of a resumption of talks between Washington and Pyongyang and agreed to maintain close coordination with Seoul, the presidential Blue House said in a statement.

Protesters wearing face masks hold banners as police officers stand guard during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. (AP PhotoLee Jin-man)

Protesters wearing face masks hold banners as police officers stand guard during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. (AP PhotoLee Jin-man)

Suh appraised Biegun’s efforts to restart the U.S.-North Korean diplomacy and asked him to continue those efforts, the statement said.

After meeting with other Seoul officials on Wednesday, Biegun suggested that Washington remains open to talks with Pyongyang. But he also accused a senior North Korean nuclear negotiator who had blamed the deadlocked talks on American hostility of being “locked in an old way of thinking.” This indicated that Washington won't likely make concessions to resume the talks despite the North’s pressure.

North Korea has previously demanded the U.S. lift international sanctions and provide security guarantee if it’s truly committed to talks.

U.S. Deputy Secretary of State Stephen Biegun, center, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

The nuclear diplomacy has yielded little progress since the breakdown of a second summit between Kim and President Donald Trump in early 2019. South Korea’s liberal government, which earlier facilitated the early parts of the nuclear diplomacy, has said it’ll push for the talks’ resumption to achieve a lasting peace on the Korean Peninsula.

U.S. Deputy Secretary of State Stephen Biegun, right, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, right, speaks to the media beside his South Korean counterpart Lee Do-hoon after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center left, walks with his South Korean counterpart Lee Do-hoon, center right, after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center left, walks with his South Korean counterpart Lee Do-hoon, center right, after their meeting at the Foreign Ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Kim Hong-jiPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun speaks during a news briefing after meeting with South Korea's First Vice Foreign Minister Cho Sei-young at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun speaks during a news briefing after meeting with South Korea's First Vice Foreign Minister Cho Sei-young at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center, and South Korea's First Vice Foreign Minister Cho Sei-young, right, leave after news briefing at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, center, and South Korea's First Vice Foreign Minister Cho Sei-young, right, leave after news briefing at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, rear left, and South Korea's First Vice Foreign Minister Cho Sei-young, rear right, attend a news briefing after their meeting at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

U.S. Deputy Secretary of State Stephen Biegun, rear left, and South Korea's First Vice Foreign Minister Cho Sei-young, rear right, attend a news briefing after their meeting at the foreign ministry in Seoul Wednesday, July 8, 2020. Biegun is in Seoul to hold talks with South Korean officials about allied cooperation on issues including North Korea. (Chung Sung-junPool Photo via AP)

A protester wearing a face mask shouts slogan during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. The letters read "Lift sanctions on North Korea."(AP PhotoLee Jin-man)

A protester wearing a face mask shouts slogan during a rally to demand the peace on the Korean peninsula and to stop sanctions against North Korea in front of Foreign Ministry before U.S. Deputy Secretary of State Stephen Biegun's arrival to meet with South Korean officials in Seoul, South Korea, Wednesday, July 8, 2020. Biegun arrived on Tuesday in the country on the first leg of his two-stop Asia trip and will meet officials in South Korea and Japan. The letters read "Lift sanctions on North Korea."(AP PhotoLee Jin-man)