In a dramatic escalation of NATO tensions, the US Congress has blocked the export of GE F110 engines crucial for Turkey’s KAAN fifth-generation fighter jet. The decision threatens to derail Ankara’s flagship defence project, delay its airpower modernization, and reshape the regional balance as Greece and Israel expand their F-35 fleets. Turkey now faces a stark choice: accelerate its domestic TRMotor engine, seek Russian or Chinese alternatives, or risk dependence on ageing F-16s.