Jihadist groups near Aleppo have called for reinforcements to fight the largest regime advance on the city in a 16-month siege, in a looming confrontation likely to test the rebel hardliners who dictate terms in
Syria
's far north.
Clashes have taken place in the south-eastern sector of the city, which has remained firmly in opposition hands since rebel groups stormed into eastern Aleppo in mid-July 2012. While the showdown is not yet thought to be the start of a decisive push, it has sharpened focus on the prevalence of extremist groups and how they found their way to the battlefield.
The two main
al-Qaida
-linked groups – the Islamic State of Iraq in Syria and Jabhat al-Nusra – are straining to hold off a regime push past the Aleppo airport to a military base, known as Base 80. A successful advance beyond this point would threaten rebel supply lines to Turkey, which for more than a year have funnelled militants, weapons, ammunition and food into the far north, in effect turning the area into an emirate within a crumbling nation state.
Now, the first significant regime counterattack is taking shape. Jihadists have allied with mainstream opposition units to battle Syrian troops whose ranks are bolstered with large numbers of militants from a militia comprised mainly of Iraqi militants, called Abu Fadl al-Abbas.
The clashes around Aleppo mark one of the few times in the two-and-a-half-year civil war that major sectarian protagonists have squared up to one another; the rebel-allied al-Qaida groups adopt an extremist Sunni ideology, while the Iraqis are fighting for Assad in the name of Shia Islam.
Al-Qaida's two proxies in the Syrian conflict are comprised mostly of foreigners. Many have journeyed from Iraq, buoyed by the sectarian insurgency again raging there, while others have chosen a simpler path through the Turkish border only 40 miles (60km) to the north. Jihadists, in particular, have taken advantage of the relatively easy passage from Turkey to Syria. The ease of access continues to fuel a view in the rebel-held north that Ankara is easing the passage of al-Qaida groups, who they have identified as the most potent arm of the opposition and most likely to threaten regime power bases.
"How else can you explain it?" said a rebel leader in northern Syria, Haji Abu-Abdullah. "It is an open gate for all-comers. We are losing, not winning, the war because of Turkey."
A second rebel leader in the Aleppo countryside agreed: "With every month that passes we are losing this war. There is clearly a policy to help al-Qaida make gains, and to make it difficult for us to hold on to what we have."
Ankara hotly denies this claim. A spokesman for the Turkish foreign ministry said: "We do not support or tolerate any radical terrorist groups. It is inconceivable that a country that has suffered from terrorism as much and for as long as we have could do such a thing. We view these radical groups as a betrayal of the revolution."