While Syria celebrates overthrowing its longtime dictator, it is also being subjected to a new ground incursion and a wave of airstrikes from its neighbor Israel that drew growing international condemnation and concern Tuesday.

Syria's civil war took a surprising turn as opposition rebels affiliated with the group Hayat Tahrir al-Sham, or HTS, took over Damascus, marking an end to President Bashar Assad's regime. CBS News senior national security correspondent Charlie D'Agata breaks down what's known about the conflict in the Middle East.

With Syrian opposition forces advancing rapidly toward the capital, Damascus, President Bashar al-Assad’s fate lay in Russia’s hands as his army melted away.

Assad, who was ousted as Syria's president by a lightning rebel offensive, very securely to Russia, the country's deputy foreign minister, Sergei Ryabkov, told NBC News in an interview aired on Tuesday.