Japan on Wednesday lodged a protest with China over the launch of English and Japanese versions of a Chinese government website asserting Beijing's claim to the Japanese-administered Senkaku Islands in the East China Sea.

Chief Cabinet Secretary Yoshihide Suga said the website, the Chinese version of which was set up in December, "distorts facts and reiterates China's own claim," which Tokyo "can never accept."

"Historically and diplomatically, the Senkaku Islands are our country's inherent territory, and in reality, we have valid control over them," the top government spokesman said at a news conference.