The U.S. Congress is set to adopt a law next week forbidding Turkey from using American funds to acquire a $4 billion missile system from a Chinese company blacklisted by Washington.

The United States has voiced deep concern over Turkey’s decision in September to enter negotiations with China Precision Machinery Export-Import Corporation for its first long-range anti-missile system.

CPMIEC, which makes the HQ-9 missile system, is under U.S. sanctions for selling arms and missile technology to Iran and Syria. […]