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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 conducting aggressive military actions

New aggressive military maneuvers by Russia are causing alarm for US officials. CNN's Barbara Starr reports on just how far Russian President Vladimir Putin will push the US -- and what President Trump will do about it.

Russia conducting aggressive military actions

New aggressive military maneuvers by Russia are causing alarm for US officials. CNN's Barbara Starr reports on just how far Russian President Vladimir Putin will push the US -- and what President Trump will do about it.