Statement by the Press Secretary on Turkey's Decision to Purchase the Russian S-400 Air Defense System
Unfortunately, Turkey's decision to purchase Russian S-400 air defense systems renders its continued involvement with the F-35 impossible. The F-35 cannot coexist with a Russian intelligence collection platform that will be used to learn about its advanced capabilities. The United States has been actively working with Turkey to provide air defense solutions to meet its legitimate air defense needs, and this Administration has made multiple offers to move Turkey to the front of the line to receive the U.S. PATRIOT air defense system. Turkey has been a longstanding and trusted partner and NATO Ally for over 65 years, but accepting the S-400 undermines the commitments all NATO Allies made to each other to move away from Russian systems. This will have detrimental impacts on Turkish interoperability with the Alliance. The United States still greatly values our strategic relationship with Turkey. As NATO Allies, our relationship is multi-layered, and not solely focused on the F-35. Our military-to-military relationship is strong, and we will continue to cooperate with Turkey extensively, mindful of constraints due to the presence of the S-400 system in Turkey.
Donald J. Trump, Statement by the Press Secretary on Turkey's Decision to Purchase the Russian S-400 Air Defense System Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/334469