Russian air power is supporting the Kurds to advance in Syria. I suppose this is because Russia regards Turkey as the regional enemy, and the Kurds are the enemy of Russia's enemy.

Azaz is near to, but not part of, the strip by which PISSI trades with Turkey. It would be a very good thing if the Kurds captured that strip.

However, Turkey's recent shelling of Kurdish fighters suggests that it is on the verge of starting a broader war against Syrian Kurds. If that happens, the Kurds might lose greatly unless they get more support.