S-400 surface-to-air missile launcher/Getty Images

The Turkish Army has confirmed that the first shipment of the Russian-made S-400 air defense missile system has arrived at the Murted Air Base in Ankara.

Turkey’s decision to purchase the equipment solidifies ties that have been developed between Russia’s President Vladimir Putin and his Turkish counterpart, Recep Tayyip Erdogan, and is just the latest setback to US-Turkish relations which have seen the two NATO allies at odds over issues such as Syria.

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The US has long warned that Turkey risked being blocked from receiving the advanced F-35 stealth jet due to Ankara’s insistence on acquiring the Russian missiles — a system US officials fear could be used to analyze and collect intelligence on the F-35.

A NATO official told CNN on Friday that: “It is up to allies to decide what military equipment they buy. However, we are concerned about the potential consequences of Turkey’s decision to acquire the S-400 system.”

The official added that “interoperability of our armed forces is fundamental to NATO for the conduct of our operations and missions.”