NATO said Friday it was "concerned" by Turkey's acquisition of Russia's S-400 missile defence system after Ankara took delivery of its first batch.
The alliance has repeatedly warned Turkey that the Russian system is incompatible with other NATO weapons systems, not least the F-35 fighter jet.
"We are concerned about the potential consequences of Turkey's decision to acquire the S-400 system," a NATO official told AFP.
"Interoperability of our armed forces is fundamental to NATO for the conduct of our operations and missions."
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