Israeli Prime Minister Benjamin Netanyahu has publicly urged US President Donald Trump to block any F-35 stealth fighter sale to Turkey, citing threats to Israel’s technological edge and regional balance of power. The US is advancing a $700 million jet engine deal for Turkey’s KAAN program ahead of the NATO summit in Ankara, but F-35 re-entry remains conditional on Turkey transferring its Russian S-400 systems to a third country. Israel refuses to share proprietary F-35I modifications with Turkey, and US law prohibits F-35 transfer while Turkey retains S-400s. Netanyahu’s intervention marks a high-profile diplomatic clash over potential US-Turkey defense alignment.