President Moon Jae-in delivers a keynote speech during the Oslo Forum at the University of Oslo in the Norwegian capital, Wednesday (local time). He reiterated his call for resuming now-suspended nuclear talks between the U.S. and North Korea. Yonhap

By Lee Min-hyung, Kim Yoo-chul

A senior presidential aide said Thursday that discussions are underway with officials from Pyongyang regarding another inter-Korean summit, before U.S. President Donald Trump's planned meeting with President Moon Jae-in, June 30.

"It's evident that the U.S. president didn't rule out the possibility of another meeting between President Moon and North Korean leader Kim Jong-un ahead of his planned visit here at the end of June. President Moon earlier raised this idea at his April summit with Trump in Washington. South Korea and the U.S. are united on that idea," the official told reporters in a briefing.

"My understanding is that the U.S. president didn't say anything on the usefulness and necessity of another inter-Korean summit," the senior aide said, adding announcements will be made once the discussions are completed.

Moon renewed his call late Wednesday (KST) for a fourth summit with Kim Jong-un ahead of his meeting with Trump.

"It is desirable to meet with Kim before Trump's upcoming trip to Seoul late June," Moon said during the Oslo Forum in the Norwegian capital, on the first anniversary of the historic meeting between Trump and Kim in Singapore. "I am ready to meet with Kim, but it is his choice whether to hold the meeting."

Amid an impasse in denuclearization talks between Washington and Pyongyang since the failure of their summit in Hanoi, the President has been going all-out to bring Kim back to the dialogue table. In mid-April, he sent a similar message to North Korea, but Pyongyang did not respond.

To resolve the ongoing deadlock in nuclear talks, Moon underlined the need for Trump and Kim to meet each other "at the earliest possible" opportunity.