A new rule, unveiled by the Commerce Department and first reported by Reuters, expands U.S. authority to require licenses for sales to Huawei of semiconductors made abroad with U.S. technology, vastly expanding its reach to halt exports to the world’s No. 2 smartphone maker.

“This action puts America first, American companies first, and American national security first,” a senior Commerce Department official told reporters in a telephone briefing on Friday.

Huawei, the world’s top telecoms equipment maker, did not respond to a request for comment.

News of the move against the firm hit European stocks as traders sold into the day’s gains, while shares of chip equipment makers like Lam Research (LRCX.O) and KLA Corp (KLAC.O) fell around 5 and 3 percent, respectively, in U.S. trading.

The reaction from China was swift, with a report on Friday by China’s Global Times saying Beijing was ready to put U.S. companies on an “unreliable entity list,” as part of countermeasures in response to the new limits on Huawei.

The measures include launching investigations and imposing restrictions on U.S. companies such as Apple Inc (AAPL.O), Cisco Systems Inc (CSCO.O) and Qualcomm Inc (QCOM.O), as well as suspending purchase of Boeing Co (BA.N) airplanes, the report said here citing a source.

The Commerce Department’s rule, effective Friday but with a 120-day grace period, also hits Taiwan Semiconductor Manufacturing Co Ltd (2330.TW), the biggest contract chipmaker and key Huawei supplier, which announced plans to build a U.S.-based plant on Thursday.

TSMC said on Friday it is “following the U.S. export rule change closely” and working with outside counsel to “conduct legal analysis and ensure a comprehensive examination and interpretation of these rules.”

The department said the rule is aimed at preventing Huawei from continuing to “undermine” its status as a blacklisted company, meaning suppliers of U.S.-made sophisticated technology must seek a U.S. government license before selling to it.

“There has been a very highly technical loophole through which Huawei has been in able, in effect, to use U.S. technology with foreign fab producers,” Commerce Secretary Wilbur Ross told Fox Business News on Friday, calling the rule change a “highly tailored thing to try to correct that loophole.”

The company was added to the Commerce Department’s “entity list” last year due to national security concerns, amid accusations from Washington that it violated U.S. sanctions on Iran and can spy on customers. Huawei has denied the allegations.