Those people you mentioned broke a cease fire the other week with a more than hour long attack on Syrian soliders killing 60 of them and injuring hundreds more.
That’s why there is no cease fire now, why an ‘aid convoy’ was attacked and why the fighting is raging around Aleppo.
To get it over as soon as possible, never supply the besieged.
The US attacked the SSA because they oppose our Jihadis, the Russians attacked the convoy because it would have aided our Jihadis. Next up direct confrontation between US & Russian air. From the Russian point of view, this “problem” could be solved with the so called joint cooperation agreement which would expose US Intel gathering and use worldwide.
The fighting around Alpo will continue until the last sucker is willing to die for his side.