Fierce clashes broke out between Syrian rebel factions and Kurdish fighters in Aleppo province this week, as the Kurdish-led Syrian Democratic Forces (SDF) continue to battle ISIS in Raqqa. Fighting erupted in Derat Ezza in the western Aleppo countryside on June 13, after Kurdish fighters attempted to take a rebel base in the area, opposition media reported. The assault was thwarted after the rebels regained the positions with support from Turkish artillery. At least 32 fighters from Ahrar al-Sham and other rebel groups were reported killed in the clashes, as well as dozens of Kurdish militants. (The New Arab, June 14)

The Obama administration has reportedly proposed a new agreement to Russia's government for military cooperation in Syria, sharing target information and coordinating air-strikes.  In exchange, Moscow would agree to pressure the Assad regime to stop bombing certain Syrian rebel groups. The US would not give Russia the exact locations of these groups, but specify geographic zones that would be safe from aerial assaults. (WP, June 30)

The US responded this week to the Syrian Kurds' declaration of autonomy, with State Department spokesman Mark Toner saying: "We've...made it clear to these Kurdish forces [in Syria] that they should not seek to create autonomous, semi-autonomous zones." He added that Kurdish forces in Syria "should not seek to retain the territory that they liberate, rather that they should make sure it's returned to whatever civilian authorities there are and able to—so that all displaced people can return there." This is a barely veiled reference to accusations that Syrian Kurdish forces are engaging in "ethnic cleansing" against Arabs and Turkmen in areas liberated from ISIS. But not only are these charges dubious, but Toner's statement ignores that often the only "civilian authorities" are in fact those of the Kurdish autonomous administration. More ominously, he warned that the US is in close dialogue with Turkey on the question and understands Ankara's "concerns regarding Kurdish forces in northern Syria." (This as Turkey is wagng a brutal counterinsurgency against Kurdish rebels within its own territory, to Washington's silence.) Ironically, he added that the Kurdish militias in Syria "are effective fighting forces and that they are willing to take on and dislodge Daesh," using the popular pejorative for ISIS in the Middle East.

A May 13 report from Amnesty International notes claims that chemical weapons were used by Syrian rebels against the besieged Kurdish enclave of Sheikh Maqsood in the divided city of Aleppo. Factions in the rebel alliance known as Aleppo Conquest "have repeatedly carried out indiscriminate attacks—possibly including with chemical weapons—that have struck civilian homes, markets and mosques, killing and injuring civilians, and have displayed a shameful disregard for human life," Amnesty said. It noted that two of these factions, Army of Islam and Ahrar al-Sham, have sent representatives to the UN-brokered negotiations in Geneva, while the others have approved delegates to represent them at the talks.

Fierce fighting between Kurdish-led YPG forces and Arab factions aligned with the Free Syrian Army is deepening a split within the Syrian resistance to both ISIS and Assad. The YPG suffered a very bad propaganda blow in clashes over the contested Azaz enclave this weekend, when its fighters paraded some 50 bodies of slain enemy forces on an open-top trailer-truck through the village of Ayn-Dakna. The bodies were taken to Afrin, seat of the local Kurdish autonomous canton, where this grisly triumphalist display waas repeated. The coverage on Turkey's official Anadolu Agency was gloating; for once they had facts to back up their disingenuous habit of refering to "YPG terrorists."

Syrian Kurds on March 17 formally declared a "Federation of Northern Syria," uniting their three autonomous cantons into one entity, in an announcement quickly denounced by the Assad regime, the opposition and regional powers alike. Democratic Union Party (PYD) official Idris Nassan said the federation brings together "areas of democratic self-administration" encompassing all the Rojava region's ethnic and religious groups. The decision was approved at a meeting in the town of Rmeilan (Jazira canton), attended by some 200 representatives of Kurdish, Arab, Armenian, Turkmen and Syriac communities. (Middle East Eye)

ISIS used "poisonous substances" during the shelling of a village in northern Iraq on March 8, with local officials reporting that over 40 residents suffered breathing problems and skin irritation, and five fell unconscious. The agents were released as ISIS fired mortar shells and rockets on Tuz Khurmatu (also rendered Taza), a Shi'ite Turkmen village south of Kirkuk. (TeleSur, Al Bawaba, March 10) This was just the latest in a growing number of such reports. On March 2, the Tal Afar district near Sinjar was hit by at least six rockets that emitted a yellow smoke on impact. Three civilians, including two children, were hospitalized with nausea, vomiting and skin irritation. On Feb. 25, after ISIS rockets hit Sinjar, nearly 200 people were treated for severe vomiting, nausea and headaches. (USA Today, March 10) Three Peshmerga troops were hospitalized after ISIS launched shells loaded with what was believed to be mustard gas on the Makhmour front Feb. 17. (Rudaw, Feb. 17)

What is happening at the northern Syrian town of Azaz, in Aleppo governorate, could prove critical in determining what the role of the Rojava Kurds will be in the Syrian war and revolution. The Kurdish YPG militia took the nearby Menegh air base on Feb. 10. Since then, Turkey has been shelling YPG forces in the area from across the border, and has issued grim warnings. Turkish Prime Minister Ahmet Davutoglu threatened to make the Menagh base "unusable" if the YPG does not withdraw, and promised the "harshest reaction" if Kurdish forces try to take Azaz. (BBC News, Feb. 15) Reuters reported Feb. 15 that 14 people were killed in Azaz when missiles hit a school sheltering displaced families. The account implied the missiles were fired by Russia, which makes sense if Azaz is being held by Turkish-backed rebel forces. But all accounts are maddeningly vague on who is in fact holding Azaz...