The U.S. would be able to buy Turkey’s Russian-made S-400 air defense system under legislation proposed in the Senate last week. The proposal is one powerful lawmaker’s attempt to alleviate the impasse between Washington and Ankara over the F-35 Joint Strike Fighter.

Senate Majority Whip John Thune, R-S.D., has proposed an amendment to the 2021 National Defense Authorization Act that would allow the purchase to be made using the U.S. Army’s missile procurement account. The move comes a year after the U.S. expelled NATO ally Turkey from the multinational F-35 program because it received the S-400 in a $2.5 billion deal.

However, Senate Foreign Relations Committee Chairman Jim Risch, R-Idaho, has introduced an amendment that would take a tougher stance, mandating the Trump administration implement CAATSA sanctions on Turkey within 30 days of passage of the NDAA. Risch has been critical of Turkish President Recep Tayyip Erdogan and accused him of bad faith in dealings with the U.S. over the S-400.

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