TOKYO, June 22, (AP): Japan and South Korea are marking the 60th anniversary of the normalization of their diplomatic relations Sunday. The two Asian powers, rivals and neighbors, have often had little to celebrate, much of their rancor linked to Japan’s brutal colonial rule of Korea in the early 20th century. Things have gotten better in recent years, but both nations - each a strong ally of the United States - now face political uncertainty and a growing unease about the future of their ties.

South Korea’s new liberal president, Lee Jae Myung, is determined to break sharply from the policies of his disgraced predecessor, Yoon Suk Yeol, who now faces a trial on charges of leading an insurrection over his imposition of martial law in December. Relations with Japan, however, are one area where Lee, who describes himself as a pragmatist in foreign policy, may find himself cautiously building on Yoon’s approach. Before his removal from office in April, the conservative former president tried to repair relations with Japan.

Yoon wanted to also tighten the countries’ three-way security cooperation with Washington to counter North Korean nuclear threats. In 2023, Yoon announced a South Korea-funded compensation plan for colonial-era forced laborers. That decision caused a strong backlash from victims and their supporters, who had demanded direct payments from Japanese companies and a fresh apology from Tokyo.

Yoon’s outreach boosted tourism and business ties, but there’s still lingering resentment in South Korea that Japan failed to reciprocate Seoul’s diplomatic concession by addressing historical grievances more sincerely. While advocating for pragmatism and problem-solving in foreign policy, Lee has also long criticized Japan for allegedly clinging to its imperialist past and blamed that for hurting cooperation between the countries.

Some experts say the stability of the countries’ improved ties could soon be tested, possibly around the Aug. 15 anniversary of Korea’s liberation from Japanese colonial rule at the end of World War II, when Lee is expected to publicly address the nation’s painful history with Japan. Some in Seoul want Japanese Prime Minister Shigeru Ishiba to mark the anniversary with a stronger statement of remorse over Japan’s wartime past to put bilateral ties on firmer ground.