The Uyghur community in Japan, though estimated to be fewer than 3,000 people, has become more visible in the past year as it presses the government to act. Mr. Rozi’s story has played no small part. Since the broadcast last year of his call with the Chinese security officer, Mr. Rozi — a fluent Japanese speaker — has appeared in the news media and before a parliamentary group to discuss the abuses in Xinjiang.

The stories of other Uyghurs have also found a wider Japanese audience in recent months, including in a best-selling graphic novel featuring testimony from women who had been imprisoned in the Xinjiang camps.

As awareness has increased in Japan, concerns about Chinese human rights abuses have grown across the political spectrum.

For years, complaints about China’s treatment of its ethnic minorities were considered the purview of Japan’s hawkish right wing. Centrists and those on the left often saw them as pretexts for replacing Japan’s postwar pacifism with the pursuit of regional hegemony.

But China’s behavior in Xinjiang has forced a reassessment among many liberals. Even Japan’s Communist Party is calling it “a serious violation of human rights.”

“China says this is an internal problem, but we have to deal with it as an international problem,” Akira Kasai, a member of Parliament and one of the party’s top strategists, said in a recent interview.

Last summer, nearly 40 members of the Japanese legislature formed a committee for rethinking Tokyo’s relationship with Beijing. In February, a longstanding conservative parliamentary committee dedicated to promoting Uyghur rights expanded its membership to include lawmakers in the country’s center-left opposition parties.

The groups, said Shiori Yamao, an opposition lawmaker, are pushing the legislature to follow in the footsteps of the U.S. government, as well as parliaments in Canada and the Netherlands, by declaring China’s actions in Xinjiang a genocide.

Members of Parliament say they are also working on a Japanese version of the Global Magnitsky Act, the American law used to impose sanctions on government officials around the world involved in directing human rights abuses.

It is unclear how much traction the efforts will get. Mr. Rozi does not believe that lawmakers will go so far as to accuse China of genocide, but he is hopeful that Japan will impose sanctions.

Mr. Rozi came to Japan in 2005 for a graduate program in engineering, eventually starting a construction company and opening a kebab shop in Chiba Prefecture, on Tokyo’s outskirts. He was not political, he said, and steered clear of any activities that might be viewed unfavorably by the Chinese government.

Everything changed in 2018, after he learned that several members of his wife’s family had been detained. Communication with his own family had also become nearly impossible amid the security clampdown.

The experience convinced Mr. Rozi that he needed to speak out, and he soon began participating in protests calling for China to close the camps. Before long, he had become a prominent voice in Japan’s Uyghur community, making media appearances, meeting with politicians and running seminars on the situation in Xinjiang. When he received the surprise phone call from his brother, he knew that his activism had caught the attention of Chinese officials.

Since Mr. Rozi’s appearance on the Japanese public broadcaster, the Chinese government has made no further attempts to contact him, he said. Phone calls to his family have gone unanswered.

He is afraid for his relatives. But speaking out has been worth it, he said: “Now pretty much everyone here knows about the Uyghurs’ problems.”

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