A South Korean official has expressed regret over a "unilateral leak" to news media of the contents of bilateral consultations on President Moon Jae-in's possible visit to Japan and talks with Prime Minister Yoshihide Suga later this month when the Tokyo Olympics begin, calling on the Japanese side to act "prudently."

The Foreign Ministry official's acknowledgement Sunday that Moon is considering visiting Tokyo to attend the Olympic opening ceremony on July 23 and holding summit talks with Suga on the sidelines came after Japanese media reports in recent days about those possibilities.

Kyodo News, citing a source at the Prime Minister's Office, has reported that the envisioned talks could be kept to around 15 minutes — much shorter than the roughly one hour expected by the South Korean side.