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"The problem is, is how do you interoperate with NATO systems with Russians — they'll never interoperate," Defense Secretary Jim Mattis said Friday after stopping in the Pentagon press room to speak with reporters before a meeting with Secretary of State Rex Tillerson to discuss options in Syria.Mattis keeps repeating the S-400 is not compatible with NATO air defenses (they can't share radar data, etc) as if that was news to the Turks. His comments come on the heels of an unsuccessful mission by the overall military commander of the US Air Force, David L. Goldfein, who traveled to Turkey last week to try and dissuade Ankara from making the S-400 deal with Russia.
"So we'll have to see, does it go through? Do they actually employ it? Do they only employ it in one area? But we'll have to take a look at it; Obviously, it's not going to be interoperable," Mattis said.
Mattis reiterated the U.S. had no formal say in how Turkey chose, or will proceed with the SAM system.
"This is a sovereign decision," he said.
Comment: See also: Britain's £150bn F-35 fighter jets are 'appallingly bad'