Australia and Britain will join the United States in a diplomatic boycott of the Winter Olympic Games in Beijing, their prime ministers said on Wednesday, as other allies weighed similar moves to protest at China's human rights record.

The United States has said its government officials would boycott February's Beijing Olympics because of China's human rights "atrocities", just weeks after talks aimed at easing tense relations between the world's two largest economies.

China said the United States would "pay a price" for its decision and warned of countermeasures in response, but gave no details.

Asked in parliament if his country would follow Washington, British Prime Minister Boris Johnson said: "There will be effectively a diplomatic boycott of the Winter Olympics in Beijing, no ministers are expected to attend and no officials."

"I do not think that sporting boycotts are sensible and that remains the policy of the government," he added, indicating that British athletes will still compete.

Earlier, Australian Prime Minister Scott Morrison said its decision came because of Australia's struggles to re-open diplomatic channels with China to discuss alleged human rights abuses in the far western region of Xinjiang and Beijing's moves against Australian imports.

Announcing the plans, Morrison said Beijing had not responded to several issues raised by Canberra, including the rights abuse accusations.

"So it is not surprising therefore that Australian government officials would not be going to China for those Games," Morrison told reporters in Sydney. Australian athletes will attend.

China has denied any wrongdoing in Xinjiang and said allegations are fabricated.

Its foreign ministry spokesman Wang Wenbin said at a daily briefing in Beijing that Australian politicians were engaged in "political posturing".

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"Whether they come or not, nobody cares," he added.

The Australian Olympic Committee said the boycott would have no impact on athletes' preparations for the Games, which run from Feb. 4 to 20, adding that "diplomatic options" were a matter for governments.

SLOW TO COMMIT

Other U.S. allies have been slow to commit to joining the boycott.

Japan is considering not sending cabinet members to the Games, the Sankei Shimbun daily said on Wednesday, citing unidentified government sources.

A South Korean presidential official said the country is currently not considering a diplomatic boycott.

President Joe Biden's administration cited what the United States calls genocide against minority Muslims in China's Xinjiang region. China denies all rights abuses.

The Winter Games will begin about six months after the Summer Games wrapped up in the Japanese capital of Tokyo following a year's delay because of the COVID-19 pandemic.

"We always ask for as much respect as possible and least possible interference from the political world," said Juan Antonio Samaranch, who heads the International Olympic Committee's coordination panel for the Beijing event.

"We have to be reciprocal. We respect the political decisions taken by political bodies."

The United States is set to host the 2028 Summer Olympics in Los Angeles and is preparing to bid for the 2030 Winter Olympics in Salt Lake City.

The American diplomatic boycott, encouraged for months by some members of the U.S. Congress and rights groups, comes despite an effort to stabilise the two nations' ties, with a video meeting last month between Biden and China's Xi Jinping.

Unless other countries joined the boycott, it would undermine the message that China's human rights abuses are unacceptable, said Bonnie Glaser, a China expert at the German Marshall Fund of the United States.

"The only option really that is available to us is to try to get as many countries as we can to stand with us in this coalition," Glaser told a U.S. congressional hearing on Tuesday.

Ties between Australia and its top trade partner, China, are at a low ebb after Canberra banned Huawei Technologies from its 5G broadband network in 2018 and sought an independent inquiry into the origins of COVID-19.

Beijing responded with tariffs on Australian commodities such as barley, beef, coal and wine.