In this March 20, 2020 photo provided by the government of the Democratic People’s Republic of Korea, DPRK leader Kim Jong-un supervises an artillery firing competition between army units in the country's west. (KOREAN CENTRAL NEWS AGENCY / KOREA NEWS SERVICE VIA AP)

PYONGYANG – US President Donald Trump had written a "personal letter" to the Democratic People's Republic of Korea leader Kim Jong-un, the official Korea Central News Agency (KCNA) reported Sunday citing a senior official.

Trump had "explained his plan to propel" relations between the two countries and expressed his intention to render cooperation in the anti-epidemic efforts, said Kim Yo-jong, the first vice department director of the Central Committee of the Workers' Party of Korea.

"We regard it as a good judgment and proper action for the US president to make efforts to keep the good relations he had with our Chairman by sending a personal letter again at a time as now when big difficulties and challenges lie in the way of developing the bilateral relations, and think that this should be highly estimated," Kim as quoted by the KCNA as saying in a statement.

READ MORE: DPRK fires 2 short-range projectiles into East Sea, says ROK

Relations between the DPRK and the US as well as the development of bilateral ties should not be judged in haste in the light of the two top leaders' personal relationship, she said, warning against drawing hasty conclusions and setting unrealistic expectations.

"If impartiality and balance are not provided and unilateral and greedy intention is not taken away, the bilateral relations will continue to aggravate," she said.

ALSO READ: ROK stresses need for DPRK, US to seek interim deal in talks

Denuclearization talks between Pyongyang and Washington have stalled since the top leaders of both sides failed to reach an agreement during their second summit in Hanoi, Vietnam in February last year.