South Korea said on Wednesday that it would shut down a Japanese-funded foundation created to help Korean women who were forced to work in brothels for Japan’s military during World War II, essentially voiding a 2015 agreement between the countries that was supposed to put the painful issue to rest.

South Korea has not formally abandoned the agreement, which both governments at the time called a “final and irreversible” settlement of the decades-old dispute surrounding the former sex slaves, known euphemistically as comfort women. But the Reconciliation and Healing Foundation was in charge of implementing the deal, and by dismantling that organization, South Korea has effectively shelved the agreement.

The 2015 deal, pushed through by a president who has since been ousted, was immediately unpopular in South Korea. Tokyo has repeatedly accused Seoul of trying to sabotage it, and Prime Minister Shinzo Abe reacted angrily to the news on Wednesday.