The United States ambassador to Turkey has announced that discussions between Washington and Ankara regarding the purchase of F-35 stealth fighter jets are progressing. Turkey has been barred from acquiring these jets since it obtained the S-400 air defense system from Russia. According to the ambassador, recent talks have been the most productive in nearly a decade, thanks to improved relations between the leaders of both countries. The United States maintains that Turkey must no longer possess or operate the Russian system to rejoin the fighter jet program, and both sides hope for a breakthrough that satisfies their security needs.