In a statement the IOC said Prime Minister Shinzo Abe agreed that "Japan will continue to cover the costs it would have done under the terms of the existing agreement for 2020, and the IOC will continue to be responsible for its share of the costs.
The appeal was made by a group of women forced to work in Japan's wartime military brothels to strike down a deal signed by the two Asian countries to settle claims over the abuse.
The spectacular appointment as environment minister of the telegenic Shinjiro Koizumi, the 38-year-old son of much-loved former PM Junichiro Koizumi, set tongues wagging in Tokyo political classes as the Abe era draws to a close.
Japan's elections are key to Shinzo Abe's plan to roll back Japan's pacifist constitution, but surveys point to lukewarm public interest in the race, and expectations of low-voter turnout.
Prime Minister Shinzo Abe visits Iran in first visit by a Japanese leader to the country since the 1979 revolution.
US President Donald Trump met with Japan's Emperor Akihito who took the Chrysanthemum Throne only three weeks ago, after his father stepped down in the first abdication in two centuries.
Japan's government worries the matter of the abductees, which Abe has made a key issue during his political career, will take a back seat to nuclear and missile issues in the US-North Korean summit.
South Korea has recently sought to revisit the issue of wartime "comfort women" while Japan agreed to apologise to the women and provided a $9.38 million fund to help them under a 2015 deal.
Australian Prime Minister Malcom Turnbull and his Japanese counterpart Shinzo Abe are hoping to agree on a security agreement on joint defence operations and exercises.
Japanese PM Shinzo Abe says he cannot accept Seoul's demand that Tokyo take further measures – including a heartfelt apology – over its wartime use of so-called "comfort women."
South Korea said the 2015 deal with Japan over South Korean women forced to work in Japan's wartime military brothels failed to meet the victims' needs.
Japan's Prime Minister Shinzo Abe said the two countries were working to counter the "dangerous aggressions" from North Korea, while Trump said he will work with Tokyo to sort out problems on trade.
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