A presidential secretary has reportedly visited the United States recently to discuss inter-Korean issues and ways to resume the stalled nuclear talks between Washington and Pyongyang.

According to a government official in Seoul on Thursday, presidential secretary for peace planning Choi Jong-kun visited the U.S. last weekend. The presidential office did not make his trip public.

Choi is thought to have met with U.S. officials to share information on the situation to resume the nuclear talks between the U.S. and North Korea.

He could have also exchanged opinions with U.S. officials on possible inter-Korean projects, as the Seoul government seeks to expand cooperation and exchanges with Pyongyang.

President Moon Jae-in said in his New Year's press conference last month that South Korea will not sit idle and wait for the U.S.-North Korea dialogue to bear fruit, vowing to expand inter-Korean cooperation to facilitate the nuclear talks.