In this file photo taken last June 12, U.S. President Donald Trump and North Korean leader Kim Jong-un sign documents as U.S Secretary of State Mike Pompeo and the North Korean leader's sister Kim Yo-jong look on at the Capella Hotel on Sentosa Island in Singapore. AP-Yonhap

By Kim Yoo-chul

President Moon Jae-in plans to deliver "messages" from U.S. President Donald Trump to North Korean leader Kim Jong-un once a fourth inter-Korean summit happens, a senior presidential aide said Sunday.

"Yes, President Moon Jae-in has messages given by U.S. President Donald Trump, which he plans to deliver directly to North Korean leader Kim at a proper time when the leaders of the two Koreas meet again," the Cheong Wa Dae official told reporters at the presidential office's press center.

"If a fourth inter-Korean summit happens, it's been widely expected President Moon also plans to share with North Korean leader Kim key observations and other background information (regarding the denuclearization talks) discussed at a recent U.S.-South Korea summit in Washington, D.C."

Regarding specifics on how the messages were given to Moon and further relevant details, the official did not elaborate.

Earlier, CNN reported that President Moon had messages from Trump for Kim.

Another presidential aide said Cheong Wa Dae was "still reviewing lots of options and scenarios" to send a special envoy to North Korea later this week to lay the ground for the fourth inter-Korean summit.

Moon suggested another meeting with Kim a week ago, but Pyongyang has yet to respond.