North Korea's state media said Monday its high-level delegation has made a "meaningful" trip to South Korea that improved stalled inter-Korean relations.

The North's delegation led by its ceremonial head of state Kim Yong-nam returned home late Sunday after a three-day visit to the South for the PyeongChang Winter Olympics. Kim Yo-jong, the younger sister of the North's leader Kim Jong-un, delivered her brother's letter to President Moon Jae-in, which includes an invitation to Pyongyang at an early date.

"The latest trip by the high-level delegation served as an important occasion in improving relations between North and South Korea, and setting up an environment for peace on the Korean Peninsula," the state-run radio station reported.

The two Koreas have engaged in a flurry of sports diplomacy since Kim Jong-un extended a rare olive branch to Seoul in his New Year's Day message, vowing to send a delegation to the Games.

Kim's invitation of Moon raises prospects for the first inter-Korean summit in more than 10 years. The two Koreas held summits in 2000 and 2007.

Liberal President Moon called for efforts to create conditions necessary for a possible summit, stressing the need for the North to resume dialogue with the United States, according to his office Cheong Wa Dae.

This photo, taken Feb. 10, 2018, shows President Moon Jae-in (C), Kim Yo-jong (L), the younger sister of North Korean leader Kim Jong-un, and Kim Yong-nam, the North's ceremonial head of state, before holding talks with the North's high-level delegation. (Yonhap)

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