A trilateral summit between Japan, South Korea and China most likely will not be held this year as Tokyo has given notice that Prime Minister Yoshihide Suga will not attend without concessions from Seoul in a feud over compensation for wartime labor, according to diplomatic sources.

South Korea was slated to host the trilateral summit, which has been held roughly once a year since 2008 as a forum to discuss economic cooperation as well as regional issues such as North Korea's nuclear weapons program.

But according to the sources, Japan told South Korea by late September it would be "impossible" for Suga to visit unless "proper measures" were taken to address its concerns.