Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Turkey Says US Offering Patriot Missiles If S-400 Not Operated Reuters ANKARA - The United States has offered to sell Turkey its Patriot missile defense system if Ankara promises not to operate a rival Russian system, Turkish President Tayyip Erdogan said, in what he called a significant softening in Washington's position. Two Turkish officials told Reuters that Turkey was evaluating the U.S. offer but that Ankara had not changed its plans for the Russian S-400 systems, which it has said it will start to activate next month. .