Turkey and Russia are discussing a possible sale of the Russian-made S-400 air defense system to a third country, with Qatar and the United Arab Emirates identified in reports as potential destinations, a move that could clear the way for Turkey to regain access to American F-35 fighter jets.

The United Arab Emirates could bolster its world-class, multilayered, and diversified network of air defense systems by deploying ex-Turkish S-400s in Dubai.

The United States and Turkey are moving closer to a possible roadmap that could pave the way for Ankara’s return to the F-35 fighter jet program, but a major obstacle remains:…