Rebel factions — moderates, Islamists and radicals alike — have had to evacuate some bases and move ammunition stores, according to opposition activists and rebel commanders. The rebels are calling for their regional backers, such as the Gulf countries and Turkey, to boost their support, including more sophisticated weapons like anti-aircraft missiles. Russia, a longtime ally of Assad, insists its campaign is solely intended to roll back Islamic militants, saying it is targeting the Islamic State group and other radicals like al-Qaida's branch, the Nusra Front, and hard-line rebel groups such as Ahrar al-Sham. On Tuesday, the Syrian Observatory for Human Rights, which monitors the war, said Russian jets in the past 24 hours had carried out 34 airstrikes in and around the central city of Palmyra, which is held by IS, and outside the group's de facto capital of Raqqa. Syrian Foreign Minister Walid al-Moallem, in an interview broadcast Monday by the Beirut-based Al-Mayadeen TV, pointed to U.N.