"In the latest escalation of the war in Syria, Russia has begun launching airstrikes from an Iranian air base. The New York Times reports this marks the first time since World War II that a foreign military has operated from a base on Iranian soil. The move comes as fighting has intensified around Aleppo, Syria’s largest city. Earlier this month, rebels fighting the Syrian government began a new offensive to break an ongoing government-backed siege of the city. The rebels have been led in part by an offshoot of the Nusra Front, which up until last month had been aligned with al-Qaeda. The International Committee of the Red Cross has described the fight for Aleppo as "beyond doubt one of the most devastating urban conflicts in modern times." The United Nations is warning of a dire humanitarian crisis as millions are left without water or electricity. For more on the humanitarian and medical crisis in Syria, we speak with Dr. Zaher Sahloul, founder of the American Relief Coalition for Syria and senior adviser and former president of the Syrian American Medical Society. He has visited Aleppo five times since the war began....."