(Adds further reaction in paragraph 13)

By Teruaki Ueno

TOKYO, April 27 (Reuters) - Japan's top court on Friday rejected two compensation claims by Chinese who suffered at Japanese hands during World War Two, as Prime Minister Shinzo Abe tried to soothe anger in Washington over his comments on wartime sex slavery.

The Supreme Court rulings against forced labourers and women forced into sexual servitude will effectively halt a raft of wartime damages cases being fought mainly by Chinese and Koreans, because lower courts look to the top court for guidance.

Two Chinese women who were kidnapped and forced to provide sex for Japanese soldiers during World War Two lost their Supreme Court appeal for damages. That claim had already been settled under a 1972 Japan-China joint statement, the court said.

Their lawyer called on the government nonetheless to provide some form of damages to the surviving of the two women, who is 80 years old.

"I hope that the government admits to the truth and takes specific measures to compensate the victim while she is in good health," said lawyer Sadahiko Sakaguchi.

The issue of sex slaves, known as "comfort women" in Japan, has attracted renewed interest after Abe sparked international outrage in March by denying that the military or the government had forced the women, most of them Asian, into sexual slavery.

Abe has since repeatedly apologised for the suffering of the victims -- most recently in a meeting with U.S. congressional leaders during an official visit to Washington.

In Friday's ruling, the top court acknowledged that the women had been forcibly taken by the Japanese military, then sent to the brothels, contrary to Abe's remarks in March.

LANDMARK RULING OVERTURNED

In another case, five Chinese who were forced to work for Japanese firm Nishimatsu Construction Co. Ltd. during World War Two lost their fight for compensation when the Supreme Court overturned a landmark ruling that had ordered the company to pay them.

That claim had also been settled under the 1972 joint statement, the court said.

China's foreign ministry spokesman Liu Jianchao denounced the decision in the Nishimatsu case, calling it "illegal and invalid".

"We strongly oppose the Japanese Supreme Court's carrying out an arbitrary interpretation of this particular article (of the 1972 joint statement), ignoring the numerous times in which China had lodged serious representations to it," Liu said in a statement on the ministry's Web site (www.fmprc.gov.cn).

He added that the "serious crimes" committed by Japanese forces in China during World War Two were a "serious human rights issue" that had not yet been properly dealt with.

Shinzo Tsuchiya, a supporter of the former labourers, called the ruling "disgraceful in light of friendly relations between Japan and China".

In 2004, the Hiroshima High Court ordered Nishimatsu to pay a total of 27.5 million yen ($230,000) to the plaintiffs.

Nishimatsu had argued that the statute of limitations had expired on violations of obligations to ensure safe working conditions for the workers.

"We have not yet seen the judgment, so we cannot comment in detail," a Nishimatsu official said. "But it is a victory for our company, so from that point of view we think it is an appropriate verdict."

The plaintiffs are among 360 Chinese forcibly brought from China to work in Japan in July 1944. Most of them worked at a Nishimatsu hydroelectric power plant construction site in western Japan until the end of the war in 1945.

Acknowledging that the Chinese labourers had gone through "extremely grave mental and physical sufferings," presiding judge Ryoji Nakagawa suggested that Nishimatsu work to provide relief to the plaintiffs.

Lawyers for the labourers said they planned to meet Nishimatsu executives later in the day.

Dozens of wartime compensation suits have been filed against the Japanese government and companies associated with its aggression in the first half of the 20th century, but almost all have been rejected by Japanese courts.

($1=118.61 Yen) (Additional reporting by Chisa Fujioka in Tokyo and Jason Subler in Beijing)

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