US ambassador to NATO told the UAE newspaper, The National, ahead of the NATO foreign ministers' summit in Brussels, that the deployment of Russian-made missiles inside NATO's defenses was unacceptable and would have consequences for Turkey.
And she added: "The idea that you can place a Russian-made missile defense system in the middle of our alliance is an idea that goes beyond the borders. We have repeatedly told Ankara that."
In December 2017, Turkey and Russia signed a $ 2.5 billion agreements to purchase Russian-made S-400 missiles, which included four sections of the system, each with nine missile launchers, and the system was delivered to Turkey in July 2019, but it has not yet activated it.
United States has banned the sale of the F-35 fighter jet to Turkey in response to this acquisition, and Washington says the Russian missile system could obtain information about this aircraft's technology.
Congressional lawmakers have urged US President Donald Trump to penalize Turkey for purchasing the missiles under the Anti-America Adversaries Act (CAATSA).
Kay Bailey Hutchinson said, "Turkey's search for hydrocarbons in the disputed territories in the eastern Mediterranean and its involvement in a dispute between Azerbaijan and Armenia over the disputed Karabakh region are problematic for NATO's unity."