The leaders of North and South Korea agreed to hold a third summit in September as Pyongyang and Washington appear at odds over a pledge to dismantle the North's nuclear weapons program, Reuters reported.

North Korean leader Kim Jong Un will meet South Korean President Moon Jae-in next month in Pyongyang, though no specific date was announced. The two leaders have already met twice this year, with Moon and Kim agreeing to push for a formal end to the Korean War, along with the U.S., Reuters reported. It was not clear what the agenda of the next meeting would be.

The summit comes as talks between North Korea and the U.S. over the "complete denuclearization of the Korean peninsula" show little sign of progress.

U.S. officials said North Korea had yet to agree to a timeline for dismantling its nuclear weapons, a commitment made by Kim in a historic meeting with U.S. President Donald Trump in June.

Meanwhile, Pyongyang has urged the U.S. to lift its sanctions on North Korea, saying it had taken various goodwill measures such as the dismantling of a nuclear site, Reuters reported.