Micron products have unspecified “serious network security risks” that pose hazards to China’s information infrastructure and affect national security, the Cyberspace Administration of China said on its website. Its six-sentence statement gave no details.

“Operators of critical information infrastructure in China should stop purchasing products from Micron Co.,” the agency said.

The United States, Europe and Japan are reducing Chinese access to advanced chipmaking and other technology they say might be used in weapons at a time when President Xi Jinping’s government has threatened to attack Taiwan and is increasingly assertive toward Japan and other neighbors.

Chinese officials have warned of unspecified consequences but appear to be struggling to find ways to retaliate without hurting China’s smartphone producers and other industries and efforts to develop its own processor chip suppliers.

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An official review of Micron under China’s increasingly stringent information security laws was announced April 4, hours after Japan joined Washington in imposing restrictions on Chinese access to technology to make processor chips on security grounds.

Business groups and the U.S. government have appealed to authorities to explain newly expanded legal restrictions on information and how they will be enforced.

Sunday’s announcement appeared to try to reassure foreign companies.

“China firmly promotes high-level opening up to the outside world and, as long as it complies with Chinese laws and regulations, welcomes enterprises and various platform products and services from various countries to enter the Chinese market,” the cyberspace agency said.

Despite that, Beijing has been slow to retaliate, possibly to avoid disrupting Chinese industries that assemble most of the world’s smartphones, tablet computers and other consumer electronics. They import more than $300 billion worth of foreign chips every year.

Beijing is pouring billions of dollars into trying to accelerate chip development and reduce the need for foreign technology. Chinese foundries can supply low-end chips used in autos and home appliances but can’t support smartphones, artificial intelligence and other advanced applications.

The conflict has prompted warnings the world might decouple, or split into separate spheres with incompatible technology standards that mean computers, smartphones and other products from one region wouldn’t work in others. That would raise costs and might slow innovation.

U.S.-Chinese relations are at their lowest level in decades due to disputes over security, Beijing’s treatment of Hong Kong and Muslim ethnic minorities, territorial disputes and China’s multibillion-dollar trade surpluses.

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