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A Russian Sukhoi Su-35 bomber lands at the Russian Hmeimim military base in Latakia province, in the northwest of Syria on May 4, 2016.
Syria's conflict erupted in 2011 after anti-government protests were put down. Fighting quickly escalated into a multi-faceted war that has killed more than 270,000 people and forced millions from their homes. / AFP / Vasily Maximov / MOY        (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)
A Russian Sukhoi Su-35 bomber lands at the Russian Hmeimim military base in Latakia province, in the northwest of Syria on May 4, 2016.
Syria's conflict erupted in 2011 after anti-government protests were put down. Fighting quickly escalated into a multi-faceted war that has killed more than 270,000 people and forced millions from their homes. / AFP / Vasily Maximov / MOY        (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)

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Russia threatens to down U.S. jets in Syria

Russia has drawn a red line after the U.S. shot down a Syrian warplane. CNN's Barbara Starr reports.

Russia threatens to down U.S. jets in Syria

Russia has drawn a red line after the U.S. shot down a Syrian warplane. CNN's Barbara Starr reports.