"A brief, more limited “mopping up” operation in Lebanon"

"...The emergence of a de facto sanctuary in northern Lebanon for the Free Syrian Army poses a particular challenge for the government of Prime Minister Najib Mikati. Instructing the Lebanese army to seal off the border would be bitterly divisive domestically, but failure to act decisively could lead, sooner or later, to direct Syrian intervention.The signs are there. The Lebanese authorities have already received several warnings from Syria demanding an end to the flow of rebels and weapons across their common border. Journalists with access to decision-makers in Damascus relay the message that the Mikati government’s policy of “warding off evil” — i.e. formal neutrality — is no longer tolerable, .......Rifaat Ali Eid is the head of the pro-Syrian Arab Democratic Party and a leading political figure in the small Alawi community in Tripoli, which has come under attack from armed Sunni militants, reportedly backed by fugitive Syrian rebels. He has given the clearest signal yet of the Syrian government’s possible intentions: “If Lebanon enters the unknown,” he predicted in mid-May, “an Arab army will intervene … the UN will request the Syrian army to enter north Lebanon to resolve the situation there, because it is the most knowledgeable and capable Arab army in this regard.”
Eid is a marginal figure in Lebanese politics, but Syria’s intervention in Lebanon in 1976 followed the same sequence: private warnings delivered by former Syrian President Hafez al-Assad to the Palestine Liberation Organization and the Lebanese Left; public hints of Syrian intentions issued by Palestinian and Lebanese parties and media affiliated to the Syrian regime; and the claim that Syria was responding to an appeal for protection from Christian leaders. When these warnings failed [to produce the desired outcome], a Syrian armored brigade entered Lebanon and stopped just across the border. It was the forerunner of a major Syrian force deployment, which entered Lebanon two months later.
There are several obstacles to a significant Syrian intervention in Lebanon in 2012..... However, the Syrian regime may regard a brief, more limited “mopping up” operation in the border zone as a dual deterrent. This kind of operation could serve both to underscore to the Lebanese the potential costs of granting sanctuary to Syrian rebels, as well as to demonstrate the regime’s determination and capacity to act, thus discouraging other neighboring countries from allowing similar sanctuaries on their soil. A limited cross-border operation in northern Lebanon would act as a “dress rehearsal” for the wider armed conflict that may develop if the Syrian crisis degenerates into full civil war, or the Friends of Syria gear up for their own military intervention.

There would be other advantages to a cross-border intervention from the Syrian regime’s perspective. The United States would no doubt condemn an incursion into Lebanon, but its stance would be complicated by its own concern, shared by other Western governments, about the possible emergence of al-Qaeda-style jihadism in Tripoli. Its inclination to assist the Lebanese Army might similarly be tempered by a reluctance to get overly involved with a government in which Hezbollah is represented. Russia is likely to regard a limited Syrian operation as a legitimate act of self-defense, despite recent statements by its foreign minister holding the Assad regime primarily responsible for the bloodshed in Syria.
The reactions of Syria’s other neighbors would be no less complex. Turkey would certainly protest a Syrian incursion into Lebanon; but it has repeatedly sent its own military into northern Iraq in pursuit of guerrillas from the Kurdish Worker’s Party (PKK), and may yet claim the right to act similarly against them in northern Syria, where their presence has increased. Iraq, which currently holds the rotating presidency of the Arab League’s council of foreign ministers, has its own problems with Sunni militants and is reported to have exchanged information with Syrian intelligence over the infiltration of jihadists from its territory into Syria. Jordan, whose king was the first Arab leader to call on Assad to step down last year, has tightened controls over the smuggling of arms destined for Syrian rebels across its border, and has seen its trade with Syria actually increase since the economic embargo was declared last November...."