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| File photo: An S-400 surface-to-air missile system |
Turkish President Tayyip Erdogan confirmed on Friday that Turkey had been testing the S-400 air defense system it bought from Russia, adding that the objection from NATO ally United States on the issue did not matter.
Washington says Ankaraโs purchase of Russian S-400 systems compromise NATO defences, and has threatened sanctions. An apparent firing test of S-400s test last week prompted a furious response from the State Department and Pentagon.
