"That does present some operational problems that we're discussing with Turkey. The State Department has the lead on that," Wilson told a meeting at the Atlantic Council on Tuesday. "We are hopeful that those [problems] will be resolved before they take delivery of that aircraft."
In April, Assistant Secretary of State for European and Eurasian Affairs Wess Mitchell said Turkey’s purchase of the S-400 air defense system from Russia could negatively affect the delivery of the F-35 jets to Ankara.
"We would not want to have that aircraft (F-35) close to the S-400 so those discussions are going on with Turkey," Wilson said.
Israel and the United States are holding talks on the supply of 100 F-35 jets to Turkey, the Tel Aviv newspaper Haaretz reported on Monday.