Top Democratic lawmakers say the ball is in Ankara’s court on rejoining the US-led F-35 Joint Strike Fighter program, but suggest that Turkey offshoring its Russian-made S-400 system won’t be enough.

Turkey is set to host NATO leaders as doubts over US commitment linger prompting Ankara to seeks its own defense deals with Paris and Washington.

Trump signals restoring Turkey's F-35 jet access ahead of NATO summit, but Congress pushes back. What the defense deal means for geopolitical risk and