The New Arab reports “Mouaz Moustafa, who heads the US-based ‘Syrian Emergency Task Force’ humanitarian organisation said that both Ukraine and the rebels wanted to work together to deal a blow to mutual enemy Russia.” However, “The New Arab‘s senior news editor Paul McLoughlin, a Syria specialist, says that while Ukraine had incentives to link up with Syrian rebel groups to attack Russian forces, it was still difficult to verify whether any of these claims are true.”
Yes, but it’s previously known that Ukrainian special forces have been active in Syria: Kyiv Post, Ukraine’s Special Forces Target Russian Drone Base in Syria