The Pentagon removed Turkey from the F-35 fighter jet program, despite U.S. President Donald Trump's earlier comments about Ankara being treated unfairly over its move to purchase the S-400 missile defense system from Russia. That Congress favored Turkey's removal was no secret either. It remains to be seen whether the United States will levy sanctions on Turkey under the Countering America's Adversaries Through Sanctions Act (CAATSA).
Turkey's decision to purchase Russian S-400 air defense system has become a major sticking point with the U.S. While Turkey attaches great importance to procuring the air defense system, U.S. policymakers, who consider Turkey's decision a complete deviation from its traditional alliance system, have begun to threaten the country.