South Korean President Moon Jae-in said Monday he’s ready for a fourth summit with North Korean leader Kim Jong Un to help salvage faltering nuclear negotiations between the North and the United States.

Moon’s comments came after Kim issued his harshest criticism yet of South Korea’s diplomatic role last week, accusing Seoul of acting like an “overstepping mediator” and demanding that it diverge from Washington to support the North’s position more strongly.

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 and the exchange of war threats by Kim and President Donald Trump.

”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.

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