S-400: How Russia's Most Feared Air Defense System Broke an Alliance, Met Its Match in Ukraine, and Became a Bargaining Chip
The article traces the 20-year arc of Russia's S-400 Triumf air defense system, from its reputation as a formidable weapon to its role in breaking alliances. It highlights how Turkey's $2.5 billion purchase in 2017 led to its expulsion from the F-35 program and US sanctions under CAATSA. The system, deployed in Syria but unproven in combat there, has been systematically targeted by drones in Ukraine. In July 2026, at a NATO summit in Ankara, President Trump signaled potential lifting of sanctions and possible Turkish re-entry into the F-35 program, while the Kremlin confirmed talks with Turkey about the S-400s' fate. China also bought the system in 2014, drawing US sanctions. The article positions the S-400 as a geopolitical symbol that may now be traded to repair the diplomatic rupture it caused.
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