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. Erdogan Stands by Russia Despite Syrian Tensions Dorian Jones ISTANBUL - Turkish President Recep Tayyip Erdogan is standing by his Russian counterpart, Vladimir Putin, despite escalating tensions between them over Syria. Erdogan confirmed Tuesday his commitment to activate Russia's S-400 missile system, claiming Washington's "position regarding the S-400 has toned down significantly." In a telephone press briefing Tuesday with James Jeffrey, U.S. special representative for Syria engagement, U.S. Ambassador to Turkey David Satterfield said the Russian missile system was at odds with Turkey's NATO partnership. "It is incompatible with Turkey's role as a NATO partner, and it would produce serious consequences with respect to the U.S. CAATSA (Countering America's Adversaries Through Sanctions Act)," Satterfield said, warning that Congress could impose sanctions in the "not-distant future." In the face of Washington's threats, Erdogan pledged this month to activate the system in April. Ankara's S-400 purchase violates the CAATSA, which forbids the acquisition of advanced Russian military systems.