The move follows a meeting on February 14 between the leaders of Turkey, Russia, and Iran in the Russian Black Sea resort of Sochi to finalize a deal reached previous year on the creation of a demilitarized zone in the region.
The stern warning came after Ankara missed a so-called "soft deadline" set by Washington to decide whether to buy the Raytheon-built Patriot missile system.
Turkey and the United States have been at loggerheads over Ankara's decision to purchase Russian S-400 systems, which are incompatible with North Atlantic Treaty Organisation systems.
The tone from the Pentagon is a shift from efforts by former Defense Secretary James Mattis to convince Congress to keep Turkey in the program.
"We have made the S-400 deal with Russian Federation, so it is out of question to take a step back".
Following a negative response from the US regarding the sale of its Patriot missile defense system, Turkey evaluated Russia's offer and made a decision to purchase the S-400 air defense system. Turkey and Russian Federation have told the world that the S-400s will be delivered in July, with operation beginning in October. "We've agreed with the Russians, we will go into joint production". Ankara insists the S-400 offers the best value for its needs and poses no threat to North Atlantic Treaty Organisation systems.
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That in turn means less congestion and waiting at Supercharger stations, where long lines can sometimes form on holiday weekends. The feature preconditions the battery for charging when the vehicle recognizes that it is navigating to a Supercharging station.
Relations have also been strained over U.S. support for a Kurdish militia in Syria, which Ankara views as a "terrorist offshoot" of Kurdish insurgents inside Turkey.
The State Department approved in December a possible $3.5 billion sale of Patriot systems to Turkey that includes advanced radar systems, control centers, launching systems and guided missiles.
The last diplomatic crisis between the two countries contributed to driving the lira to a record low in August.
"If they take the S-400s then ... they would not get the F-35s and the Patriots", Summers said, referring to the Patriot surface-to-air missile system, which has a primary function of defending against ballistic missiles and has been presented as an American-made alternative to the S-400.
While the United States maintains global military superiority over Russia, evolving Russian capabilities threaten to erode our competitive military advantage, challenge our ability to operate uncontested in all domains and diminish our ability to deter Russian aggression.He hinted at concerns that Turkey's using both the S-400s and the F-35 could provide Russian Federation with valuable information on how to defeat the tech-heavy jet slated to become a signature fighter for North Atlantic Treaty Organisation countries and their partners.
Some have said the United States is concerned that the S-400 poses security risks to the F-35 Joint Strike Fighter project.
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