The Pentagon has already expressed its dissatisfaction with the arms deal.
Hurriyet newspaper quoted Erdogan on Tuesday as telling a group of reporters that signatures have been put on accords and that Turkey has made a down payment on the surface-to-air defense systems.
The S-400 is most advanced missile system air-to-ground that you have Russian Federation, capable of reaching a target at a range of 400 kilometers and that no member of atlantic alliance now uses.This purchase of military material to a third-party vendor to partnership will raise issues within NATO.
"Both [Russian] President [Vladimir] Putin and I are determined to realize this deal", Erdoğan said.
United States steps up tougher NKorea sanctions
The NATO military alliance is calling for global pressure to be ratcheted up against North Korea following its latest nuclear test .
Anticipating potential concern among Turkey's fellow North Atlantic Treaty Organisation members over the deal, Erdogan said Turkey would continue to "make the decisions about our own independence ourselves". "For this reason, we perfectly understand reactions of several western countries which try to exert pressure on Turkey", he added.
Turkey's European Union affairs minister Omer Celik said that Germany's decision to suspend arms exports to the country will damage counterterrorism efforts in general as well as will pose a threat to European Union security.
Merkel said that her conservative-left coalition government already took a more restrictive policy on such exports, with permits issued on a case-by-case basis, if Germany's Federal Security Council decides in their favor.