Turkey received the first components of Russia’s S-400 air-defence system on 12 July, proceeding with a purchase Washington said was incompatible with NATO defence arrangements.

What happened

Aircraft delivered equipment to Mürted Air Base near Ankara. Turkish officials defended the purchase as a sovereign security decision after alternative negotiations failed to meet their requirements.

Why it mattered

The United States argued that operating the S-400 alongside the F-35 could expose sensitive information about the stealth aircraft, triggering consequences for Turkey’s role in the fighter programme.

Context and consequences

The episode illustrated Ankara’s complex relations with Russia and its Western allies, becoming a lasting issue in US-Turkish defence ties.

Sources