Turkey’s Foreign Minister Mevlut Cavusoglu said Washington has yet to respond to a proposal to set up a technical committee to review possible security threats that Russia’s S-400 missile defense system could pose to the US F-35 fighter jet program. US officials have warned of consequences if the purchase of the advanced Russian system is finalized, while Turkish officials say the deal cannot be canceled. Speaking at a news conference with his Polish and Romanian counterparts in Ankara on Friday, Cavusoglu said Turkey is taking the utmost care to ensure that the S-400 system is under its full control, AP reported. He said that Turkey does not believe that the S-400 would threaten the F-35 program, of which Ankara is also a partner.