South Korean President Moon Jae-in stated that he’s ready for a fourth summit with North Korean leader Kim Jong Un to help salvage faltering nuclear negotiations between  Pyongyang and Washington, AP reported.

Moon met Kim three times last year and also brokered nuclear talks between North Korea and the U.S. following tensions created by the North’s nuclear and missile tests.

But there are fears in Seoul that the hopeful developments of 2018 could be undone because of the mismatched demands between Washington and Pyongyang over sanctions relief and disarmament, which have derailed a high-stakes Trump-Kim meeting and prolonged a stalemate in negotiations.

“Whenever North Korea is ready, we hope that the South and North could sit down together and hold concrete and practical discussions on ways to achieve progress that goes beyond what was accomplished in the two summits between North Korea and the United States,” Moon said in a meeting with senior aides.

According to him,   it is Seoul’s “outmost priority” to prevent nuclear negotiations between the U.S. and North Korea from derailing, and there is speculation that he will soon announce a plan to send a special envoy to Pyongyang, North Korea’s capital, in an effort to rescue the talks.