Osaka Mayor Toru Hashimoto had suggested that US servicemen in the southern prefecture of Okinawa, where relations are frequently tested by violent crimes including rapes and assaults, patronise legal sex businesses there.
As the remark triggered disgust in the United States and outrage in Okinawa, Hashimoto said he would retract it at a press conference scheduled Monday at the Foreign Correspondents' Club in Tokyo.
"The word 'sex businesses' was inappropriate," he said in a today programme by YTV broadcaster. "I must apologise to the US military and American people and retract my comment" at the Monday press conference..
Most historians agree the Asian women were pressed into sexual slavery for the Japanese imperial army. Hashimoto has insisted Japan's soldiers were not unique in brutalising women.
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Yesterday, Hashimoto said his original remarks were misinterpreted.
"I happen to have used the word 'necessity' but it doesn't mean I personally meant it was necessary," he said.
Hashimoto was scheduled to meet a pair of former so-called comfort women yesterday, but the elderly South Korean women cancelled over fears of becoming political pawns in a long-running diplomatic dispute that has stoked tensions between Tokyo and Seoul.
Sex slavery is a particularly sensitive issue in Korea, a former Japanese colony whose people made up many of the up to 200,000 "comfort women" forcibly drafted into brothels for the Japanese military during World War II.