U.S. likely to suspend training Turkish pilot following Ankara's purchase from Russia

The United States is seriously considering suspending training for Turkish pilots on advanced F-35 fighter jets as Ankara moves ahead with plans to purchase a Russian missile defense system despite objections from Washington, sources told Reuters.

The two NATO allies have argued for months over Turkey's order for the Russian S-400 defenses, which Washington says are incompatible with the Western alliance's defense network and would pose a threat to U.S. F-35 stealth fighter jets which Turkey also plans to buy.