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NATO Secretary-General Jens Stoltenberg says that Turkey's decision to purchase missile defense system from Russia is a challenge while being a national decision.
"It is a challenge and is well known that there is a disagreement between Turkey and especially the United States on this issue," Anadolu Agency quoted Stoltenburg as saying at the conservative Heritage Foundation think tank in Washington D.C

The NATO chief underscored that for NATO, which is an alliance of 29 North American and European countries, the most important thing is to see "that different systems can work together".
It is reminded that in December, Turkey signed an agreement with Russia that will see Moscow delivering the missile defense system to Ankara by early 2020. In June, the U.S. Senate passed a bill prohibiting sales of F-35 jets to Turkey, citing the S-400 purchase.