A U.S. Senate committee passed a spending bill on Thursday including a provision to block Turkey's purchase of Lockheed Martin F-35 Joint Strike Fighter jets unless it drops a plan to buy S-400 missile defense systems from Russia.
The measure is an amendment to the Fiscal Year 2019 State, Foreign Operations and Related Programs Appropriations Act.
If it became law, the measure would block the transfer of F-35s to Turkey until the secretary of state certified that Turkey is not purchasing and will not accept deliveries of the Russian systems.