South Korea lashed out Saturday at Prime Minister Shinzo Abe for disavowing Japan's responsibility for using Asian women as sex slaves for its troops in World War II.

Abe said Thursday there was no proof that "comfort women" were forced into sexual slavery during the war.

The remark triggered outrage throughout Asia.

Abe's statement is "aimed at glossing over the historical truth and our government expresses strong regret," South Korea's Foreign Ministry said.

The statement said the comment "made (us) doubt the sincerity" of Japan's repeated apologies for its wartime past.

"We once again urge responsible leaders of Japan to have a correct understanding of history," the ministry said.

Historians say that about 200,000 women, mostly from Korea and China, served in Japanese military brothels throughout Asia in the 1930s and 1940s.

Abe's statement contradicted evidence in Japanese documents, unearthed in 1992, that historians said showed that military authorities had a direct role in working with contractors to forcibly procure women for the brothels.

Earlier, in Washington, South Korea's Foreign Minister Song Min Soon also criticized Abe, saying people who doubt that the Japanese Imperial Army forced Asian women into sexual slavery during the war had "better face the truth."