Earlier this month, acting US Defence Secretary Patrick Shanahan formally notified Ankara that it would not be allowed to receive the F-35 fighter jets it had already purchased if it went ahead with the S-400 deal.
Moscow is determined to meet all demands in order to supply S-400 defence system to Turkey as was initially requested and agreed, Russian Deputy Foreign Minister Sergei Ryabkov said on Tuesday.
Prior to that, acting US Defence Secretary Patrick Shanahan formally informed Turkey that it would not provide the F-35 fighter jets it had already purchased if it failed to drop the S-400 agreement.