Abe will be the first Japanese prime minister to visit these former Eastern Bloc countries. Keeping this promise is an global and universal principle.
He said that although it was a political agreement, it excluded the victims and ordinary South Koreans.
Japan's foreign ministry press secretary Norio Maruyama told reporters in Tallinn that "step by step we understand which way North Atlantic Treaty Organisation can be a useful entity for Japan and in which area can Japan be useful for North Atlantic Treaty Organisation".
"We can by no means accept South Korea's unilateral request for additional measures".
Top Japanese government spokesman Yoshihide Suga said Japan "isn't thinking of moving even a millimetre on the deal", while Foreign Minister Taro Kono said any attempt to revise the deal would render bilateral ties "unmanageable".
In an editorial Friday, the Mainichi Shimbun said Abe's absence at the Olympics will only leave a strong impression of cooling ties between Seoul and Tokyo, which would only benefit North Korea.
The South Korean side also believes that prior to the deal being made with Japan, those who served as "comfort women" were not sufficiently consulted and their feelings not fully taken into account at the time.
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The so-called "comfort women" issue involved soldiers from the Imperial Japanese Army (IJA) during World War II, forcibly coercing and even kidnapping girls, some of them underage, and women, and forcing them to work as sex slaves, servicing Japanese soldiers at military brothels during the war.
Japan thought that by striking this deal in 2015, it could put the past away and move forward.
INTERNATIONAL RELATIONS PROFESSOR KIM JAE CHUN of Sogang University, on the difference in opinion over the comfort women deal.
Tokyo has reacted angrily to comments on the issue this week by Seoul.
Foreign ministers from South Korea and Japan are to hold talks in Vancouver, Canada, next week on the sidelines of an global gathering aimed at discussing more effective sanctions on North Korea.
But he said Wednesday: "The fact that there was an official agreement between Korea and Japan can not be denied".