Turkey is seeking Russia’s consent to transfer air defense systems it bought from Moscow to a third country, an effort aimed at clearing the way for the purchase of US-made F-35 fighter jets.

Ankara made the approach in recent weeks, just months after President Recep Tayyip Erdogan proposed returning the S-400 missile systems to Russia — an idea that gained little traction, said Turkish officials, who asked not to be identified because the discussions are private.