– China said Monday that it would sanction U.S.-based nonprofits including the National Endowment for Democracy and Human Rights Watch (NED), in retaliation for a new U.S. law in support of Hong Kong's protesters.

Foreign Ministry spokeswoman Hua Chunying did not give details about the sanctions or articulate how the nonprofits' operations will be affected in the semiautonomous city, where many maintain regional offices to conduct China-related work.

China also will suspend rest-and-recuperation visits to Hong Kong by U.S. military ships and aircraft, Hua said, adding that China could take further retaliatory moves.

The comments were a stark warning to organizations that China sees as aligned with Washington — and the first salvo in what Beijing has promised to be "forceful" retaliation against the United States for the Hong Kong Human Rights and Democracy Act, which was passed by Congress and signed into law by President Donald Trump last week.

The move could further elevate Hong Kong as a flash point between Beijing and Washington. The Chinese government has viewed the five-month protests as a U.S. attempt to foment a revolution rather than an outpouring of genuine anger over police conduct and declining political freedoms.

Organizations including the NED, Human Rights Watch, Freedom House, the National Democratic Institute for International Affairs, and International Republican Institute will be sanctioned for their "odious behavior" in Hong Kong, where they have "strongly instigated extremely violent criminal activities," Hua said. "These organizations deserve to be sanctioned, and they must pay the price for it."

China, echoing governments including Venezuela and Egypt, has previously taken aim at the NED, a group established in 1983 and funded by Congress to promote democracy worldwide. The Foreign Ministry in August distributed a report that named the NED as a U.S. intelligence front and listed its history of funding political groups in Hong Kong going back 20 years.

It is not clear how the sanctions would affect foundations or corporations that donate to the blacklisted nonprofits. Few of the groups have staff on ­China's mainland.

Human Rights Watch Executive Director Kenneth Roth said his organization does not receive funding from any government and "regrets" China's announcement of sanctions.

"Rather than target an organization that seeks to defend the rights of the people of Hong Kong, the Chinese government should respect those rights," Roth said.

Foreign nonprofit workers inside China have long faced suspicion and a degree of vulnerability.

Michael Kovrig, a former Canadian diplomat working for the International Crisis Group nongovernmental organization, has been detained for the past year.

Peter Dahlin, a Swede, was detained in 2016 for his involvement in providing legal aid to a network of Chinese activists.

China has elevated scrutiny of foreign nonprofits since the passage of an NGO law in 2016 that gave security officials broad supervision powers.