South Korean President Moon Jae-in on Tuesday urged the U.S. and North Korean leaders to make a “bold decision” to make progress in now-stalled nuclear talks, pledging to make a “decisive opportunity” at the upcoming inter-Korean summit.

Speaking at the Cabinet meeting, Moon said the “complete denuclearization on the Korean peninsula” is the issue that must be resolved through bilateral negotiations between Washington and Pyongyang.

“But we can’t help with making efforts to mediate and promote [talks] as mediator until the North and the U.S. smooth out their dialogue and communications,” he told his key aides.

Moon said U.S. President