Turkey's purchase and deployment of Russian S-400 air defense systems remains a source of deep friction within NATO. The United States removed Turkey from the F-35 fighter program over the purchase and has imposed limited sanctions. Turkey has maintained the S-400 while simultaneously seeking to re-enter the F-35 program, and the standoff has not been resolved despite years of negotiation.
The broader pattern of Turkish foreign policy hedging, including economic ties with Russia, a neutral stance on the Ukraine conflict, and active diplomatic engagement with Iran, creates structural tension with Turkey's role as a NATO ally guarding the Bosphorus strait and hosting significant US military infrastructure. Several NATO members have privately questioned whether Turkey's reliability as an ally is consistent with its current geopolitical positioning.
