FILE - In this June 12, 2018, file photo, U.S. President Donald Trump, right, shakes hands with North Korea leader Kim Jong Un at the Capella resort on Sentosa Island in Singapore. South Korea said Friday, Jan. 10, 2020, it conveyed a message by President Donald Trump to North Korean leader Kim Jong Un wishing him a happy birthday, which is believed to be Jan. 8. (AP Photo/Evan Vucci, File)

FILE - In this June 12, 2018, file photo, U.S. President Donald Trump, right, shakes hands with North Korea leader Kim Jong Un at the Capella resort on Sentosa Island in Singapore. South Korea said Friday, Jan. 10, 2020, it conveyed a message by President Donald Trump to North Korean leader Kim Jong Un wishing him a happy birthday, which is believed to be Jan. 8. (AP Photo/Evan Vucci, File)

SEOUL, South Korea (AP) — South Korea said Friday it conveyed a message by President Donald Trump to North Korean leader Kim Jong Un wishing him a happy birthday, which is believed to be Jan. 8.

Returning from a visit to Washington on Friday, Chung Eui-yong, South Korea’s presidential national security director, told reporters that Trump requested Seoul to deliver the message to Kim during a meeting at the White House this week.

Chung didn’t disclose what the message specifically said, but said Seoul sent it to Pyongyang on Thursday through “proper means.”

Kim last week opened the new year expressing deep frustrations over stalled nuclear negotiations with the Trump administration and vowed to bolster his nuclear arsenal as a deterrent against “gangster-like” U.S. sanctions and pressure.

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The North in past months has severed virtually all cooperation with the South, while demanding Seoul to break away from Washington and restart inter-Korean economic projects held back by U.S.-led sanctions. But the Koreas still operate a liaison office in the North Korean border town of Kaesong.

Seoul had lobbied hard for the resumption of nuclear negotiations, with Chung shuttling between Pyongyang and Washington to help set up the first summit between Kim and Trump in June 2018.

But negotiations have faltered since the collapse of the second Kim-Trump meeting in February last year, when the U.S. side rejected North Korean demands for major sanctions relief in exchange for a partial surrender of its nuclear capabilities.

Trump and Kim met again in June and agreed to resume negotiations. But an October working-level meeting in Sweden broke down over what the North Koreans described as the Americans’ “old stance and attitude.”

Despite the standstill in talks, Trump and Kim have both described their personal relationship as good. Trump has boasted about the “beautiful” letters he has received from Kim.

North Korea has never officially confirmed Kim’s birth date. While covering a 2014 visit to the country by Dennis Rodman, North Korean state media said the former NBA star organized an exhibition game on Jan. 8 to celebrate Kim’s birthday.