President Tayyip Erdogan said Turkey still intended to buy a second batch of S-400 missile defense systems from Russia, a move that could deepen a rift with NATO ally Washington and trigger new U.S. sanctions.

Washington says the S-400s pose a threat to its F-35 fighter jets and to NATO's broader defense systems. Turkey says it was unable to procure air defense systems from any NATO ally on satisfactory terms.

-Reuters -