BEIRUT, Lebanon — Syrian rebels are making significant advances in their battle against government forces, raising new questions about President Bashar Assad's ability to hold onto power and adding urgency to the quest by the international community for a unified and effective political opposition that could take control should his regime collapse.
In the past week, the rebels have seized five important military facilities in the north, the east and near the capital, Damascus, capturing sizable quantities of weaponry, further isolating remaining government positions and freeing up rebel forces to concentrate on attacking them.
None of the battles alone represented the kind of decisive military victory that the rebels need if they are to claim control of an entire city or province and prod the international community for greater support. The rebels, most of them grouped loosely under the umbrella of the Free Syrian Army, have not yet demonstrated the capacity to capture any of the country's major cities, and whether they will ever be in a position to dislodge the regime from the heavily guarded capital without help is in question.
Taken together, however, the gains underscore both the steadily growing effectiveness of the rebel force and the accelerating erosion of what had once been one of the region's most powerful armies, now severely depleted and on the defensive.
The fighting is piecemeal, intense and likely to persist for many more months as regime forces and rebel fighters battle it out town by town, base by base. But no longer is it possible to describe the war in Syria as a stalemate, said Jeffrey White, a defense fellow at the Washington Institute for Near East Policy, and the pace of rebel gains raises the prospect that a collapse of government forces could come sooner than has been expected.
"The war is turning against the regime and it's turning at a faster rate than we had seen before," he said. "There's a reasonable chance there will be some kind of breaking point, and the regime will collapse in a hurry. It's not probable, but it's possible, and then the guys with the guns will be in charge."
Putting a timeline on the regime's likely demise is impossible, analysts say, in part because so many other variables are in play, from the state of the Syrian economy to the prospect that the government could resort to the use of greater force, including its arsenal of chemical weapons.
But there seems to be little doubt that the momentum is shifting to the rebels' advantage, said Joseph Holliday of the Institute for the Study of War, a Washington think tank.
That in itself is having a cumulative effect on the battlefield. Each new base that falls yields new stashes of weaponry, and as bigger bases are overrun, the quality of those weapons is also increasing. Videos released after the capture last week of Base 46, a major facility to the west of Aleppo, showed fighters acquiring possession of tanks, armored personnel carriers, artillery and surface-to-air missiles as well as large quantities of ammunition.
In a video released overnight Saturday of the assault on the most recent base to fall, the Marj al-Sultan air base outside Damascus, fighters are seen using a tank to storm the perimeter. They claim to have destroyed eight aircraft, including three helicopters and two MiG fighter jets, contributing to the slow depletion of the air force on which the regime has increasingly relied to remain in the fight in areas from which its forces have been ejected.
Meanwhile, the government's ability to resupply and reinforce its far-flung bases is diminishing and it has not launched a significant offensive to recapture ground since August.