The Syrian military and the Kremlin conducted joint airstrikes Monday on parts of Syria that rebels took control of over the weekend. Fighters seized Syria's largest city, Aleppo, after a battle with troops loyal to dictator Bashar al-Assad.

Syria’s long civil war has reclaimed global attention after insurgents seized most of its largest city and dozens of nearby towns and villages.

Syrian opposition forces in recent days seized Aleppo, one of Syria's largest cities, reigniting a 13-year civil war.

Syria's civil war has exploded back into life after Islamist rebels launched a lightning offensive on the northern city of Aleppo.

The Syrian government has lost control of the city of Aleppo, the country's second-largest, as opposition forces have made more territorial gains, a war monitor reported on Sunday. "The Syrian regime has completely lost control of Aleppo,

Islamist rebel group Hayat Tahrir al-Sham launched a lightning assault against pro-Assad forces in Aleppo. Here’s who else is fighting in Syria’s civil war.