The US has always put arms embargoes and blockades on Turkey, even having formal ones in the 1960s and 1970s. The US also arms the terrorists in Turkeys south to attack and terrorize the country. According to CIA agent John Stockwell and others they have been arming those terrorists since the 1970s on Kissingers orders to attack Turkey. The US also refused to sell defensive systems to Turkey under the Obama blockade. The Turks bought it then instead from the Russians. Other NATO countries also have both Russian weaponry and the S-class defensive system like Greece, Bulgaria and Hungary. Turkey is clearly not competent enough to build it itself which is why it bought it.