It's been a week of rising tensions in Syria with Russia stepping up airstrikes and naval bombardments in support of Syrian President Bashar al-Assad and in some cases against rebel groups supported by the United States.
Russia's War Against Ukraine
CBS News: Obama on topics including Russia’s incursion in Syria, ISIS and the 2016 presidential race (VIDEO)
US President Barack Obama arrives to speak at a Democratic National Committee event at the Warfield Theater Oct. 10, 2015 in San Francisco, California.
