Japan has requested that an arbitration board be assembled to assist in the resolution of South Korean labor compensation issues. Japan ruled over South Korea from 1910-1945. A pact was forged between the two countries in 1965 that was intended to cover any issues that might arise from Japan’s former rule over the Korean Peninsula. Last year, South Korea’s courts ordered Japan to compensate South Korea for wartime labor. Japan is now asserting that South Korea has violated the pact, and is requesting arbitration in order to settle the dispute.
See "Japan seeks arbitration with South Korea over wartime labor compensation", Reija Yoshida, The Japan Times, May 20, 2019