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Turkey's Erdogan says will jointly produce S-500s with Russia after purchase of S-400s

ANKARA, May 18 (Reuters) - Turkish President Tayyip Erdogan said on Saturday that the purchase of S-400 defence systems from Russia was a done deal, adding that Ankara would also jointly produce S-500 defence systems with Moscow.

U.S. officials have called Turkey's planned purchase of the S-400 missile defense system "deeply problematic," saying it would risk Ankara’s partnership in the joint strike fighter F-35 program because it would compromise the jets, made by Lockheed Martin Corp.

However, Erdogan told a televised question and answer session with university students in Istanbul that Turkey had carried out technical work and found that such a problem did not exist.

"They (the U.S.) are passing the ball around in the midfield now, showing some reluctance. But sooner or later, we will receive the F-35s. (The U.S.) not delivering them is not an option." (Reporting by Ece Toksabay; editing by Diane Craft)