The foreign ministers of South Korea, Japan and China met on Saturday for the first time in three years, to try and improve frosty ties and restore a regular three-way summit of their leaders, stalled because of tension over history and territory.
The three officials also held bilateral meetings in which they agreed to cooperate in response to North Korea's nuclear and missile programs.
Arriving for a meeting with South Korean Foreign Minister Yun Byung-se, China's Wang Yi said he would discuss all the issues of interest to Beijing, signaling the subjects of the China-led Asian Infrastructure Investment Bank (AIIB) and the THAAD missile defense system were not off the table.
"They pledged to work together to resume meaningful dialogue for substantive progress on ending the North's nuclear program and to cut off advances in its nuclear capability," South Korea's foreign ministry said after a meeting of the South Korean and Chinese ministers.
Yun also held separate talks with Japan's Fumio Kishida.
The meetings take place against the backdrop of South Korea and China's cool ties with Japan over what they see as its reluctance to properly atone for its wartime past. Both also have territorial disputes with Tokyo over islands.
The three-way talks, set for later on Saturday, will be a stepping stone towards restoring what had been an annual summit of the three countries' leaders to discuss cooperation, Yun said this week.
An annual event since 2008, it has been on hold since May 2012.
Yun and Wang discussed China's invitation for South Korea to join AIIB and Yun said Seoul was reviewing its options, Yonhap news agency quoted an unnamed official as saying.