In this June 30, 2019, file photo, US President Donald Trump meets with DPRK leader Kim Jong-un at the border village of Panmunjom in the Demilitarized Zone, ROK. (SUSAN WALSH / AP)

SEOUL - US President Donald Trump sent a birthday message to Kim Jong-un, top leader of the Democratic People's Republic of Korea (DPRK), through the Republic of Korea (ROK), Yonhap news agency reported Friday.

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Chung Eui-yong, top national security adviser for ROK President was quoted as saying at the airport upon his return from Washington that Trump had remembered the day they met was Kim's birthday and had sent him birthday greetings.

"President Trump asked President Moon to deliver his message to Chairman Kim," said Chung, without elaborating whether it was a written message or whether it included anything beyond the greeting.

Kim's birthday is believed to be Jan 8. 

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Chung returned earlier in on Friday from his trip to Washington. During the trip, Chung reportedly had a brief meeting with Trump.

On Wednesday, Chung also met the US special envoy for the DPRK, Stephen Biegun, and reaffirmed close US-ROK coordination on the DPRK, State Department spokeswoman Morgan Ortagus said.

With Reuters inputs