US Deputy Secretary of State Stephen Biegun held back-to-back talks with senior Seoul officials Wednesday to explore ways to revive stalled nuclear talks with North Korea, despite Pyongyang's repeated rejections of dialogue with Washington.

Biegun began his three-day trip here Tuesday, apparently to renew the US' commitment to diplomacy with the communist state and forestall escalation of tensions caused by its recent demolition of an inter-Korean liaison office, warnings of now-suspended military plans and hostile rhetoric.

The US diplomat, who doubles as Washington's top nuclear envoy, paid a courtesy call on Foreign Minister Kang Kyung-wha and held the "Strategic Dialogue" with First Vice Foreign Minister Cho Sei-young.

"Thank you for hosting me and everything is complicated but your government is very collaborative in working out the details in getting here safely and we certainly want to be safe too," Biegun told the foreign minister.

At their separate talks, Biegun and Cho were expected to discuss an array of bilateral and broader issues, including the impasse in the allies' defense cost-sharing talks, the US' move to expand the Group of Seven advanced countries and its push to shift global supply chains away from China.

Biegun is also scheduled to meet with Seoul's top nuclear envoy, Lee Do-hoon, with their agenda likely to focus on how to create momentum for dialogue with Pyongyang.

The nuclear talks between the US and the North have not been held since their last working-level session in Sweden in October, as the two sides remained at odds over the extent of Pyongyang's denuclearization and Washington's sanctions relief.

After the talks with Lee, Biegun is expected to reiterate the US' readiness to reengage with the North in a public message. But skepticism lingers over whether Pyongyang will warm to dialogue, as it suspects Washington eyes talks with a political intent ahead of the US election in November.

Pyongyang's First Vice Foreign Minister Choe Son-hui said Saturday that the North does not feel any need to sit face to face with the US, accusing Washington of using nuclear talks as "nothing more than a tool for grappling its political crisis."

Just hours before Biegun's arrival, Kwon Jong-gun, the North's foreign ministry's director general in charge of US affairs, also rebuffed the possibility of talks.

Biegun's trip came amid growing concerns that a recent rise in cross-border tensions could threaten to derail the yearslong endeavor to denuclearize the North and lay the groundwork for lasting peace on the peninsula.

Last month, tensions rose sharply as the North cut off cross-border communication, blew up the joint liaison office in its border city of Kaesong and threatened to take military steps against the South, such as redeploying troops to border areas.

The North took the provocative steps ostensibly in anger over anti-Pyongyang leaflets sent from the South, but observers say they appeared aimed at diverting public attention from its deepening hardships caused by biting sanctions and the new coronavirus.

Biegun plans to fly to Japan on Thursday before returning home. (Yonhap)