As in Yugoslavia in the 1990s, the US succeeded to impose one-sided, unilateral warfare rules on Syria via Russia, which set limits on what Syria can and cannot do, and, at the same time, made Russia help with its intelligence gathering

Russia made a great agreement with the US, 1) under which Russia is obliged to give the US information on all the SAA flights over Syria (that's perhaps why, in combination with the anti-air missiles, the takfiris have significantly increased their ability to shoot down SAA planes and helicopters). 2) the Russian-US agreement negotiated without the Syrian government also restricts Syria's sovereignty and what the SAA can and cannot do--it is even prohibited to attack areas occupied by al Qaeda/Nusra!!!

In other words, via the Kremlin, the US found a way of prohibiting the Syrian government and the Syrian Arab Army to attack al Qaeda in Syria--at least in US-designated off-the-limits areas.

Esp: 
  "The JIG is to be provided advance notice of regime air operations “that are permitted as exemptions”
- The regime is prohibited from flying in designated areas, including areas with Al Nusra presence and areas where the opposition is dominant.
- Russia to provide advance notice of all regime air operations."
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via Marc Fasnacht:
The 'JIG' memorandum of understanding:
"US-Russian partners in JIG reportedly agreed to the following neo-colonialist impositions on Syria:
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"Information regarding Russian-US collaboration to be discussed today leaked. Main points include:
The US-Russian “Joint Implementation Group” (JIG) would be headquartered near Amman, Jordan- Participants will commit to “supporting deliberate targeting of Al Nusra Front”
- Participants may communicate targeting information for targets that permit synchronised, operations against Daesh
- US and Russia should inform one another through the JIG of final plans for operations against a mutually selected target no later than the day before execution.
- The JIG is to be provided advance notice of regime air operations “that are permitted as exemptions”
- The regime is prohibited from flying in designated areas, including areas with Al Nusra presence and areas where the opposition is dominant.
- Russia to provide advance notice of all regime air operations."
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leaked information via Christopher Lucas"