South Korean President Yoon Suk-yeol asked to send South Korean experts to monitor the planned release of water from Japan's tsunami-hit Fukushima No. 1 nuclear plant during a meeting on Wednesday with the Japanese prime minister, Yoon's office said.
The two leaders held a meeting on the sidelines of the NATO summit in Lithuania, during which they also condemned North Korea's launch of an intercontinental ballistic missile as a serious provocation that escalates tension.
Yoon has been pushing to mend strained ties with Tokyo following years of feuds over historical issues, which undercut cooperation between the key U.S. Asian allies despite increasing nuclear and missile threats from North Korea.