The Chinese government will match President Trump’s plan for 34 percent tariffs on goods from China with its own 34 percent tariff on imports from the United States, China’s Finance Ministry said on Friday.

Separately, China’s Ministry of Commerce said it was adding 11 American companies to its list of “unreliable entities,” essentially barring them from doing business in China or with Chinese companies. And the ministry imposed stringent limits on exports of certain rare earth elements that are mined almost exclusively in China and are used in everything from electric cars to smart bombs.

China’s customs agency also said that it would halt chicken imports from some of America’s agricultural exporters.

Taken together, the measures released by three different government agencies within minutes showed that China has no intention of backing down in the trade war that Mr. Trump began this week with his own steep tariffs on imports from around the world.

This is a developing story. Please check back for updates.

Claire Fu contributed reporting from Seoul.