Once Putin realized the added benefits of enmity toward ISIS for Russia's interests, he started making exaggerated anti-ISIS statements to provide enough legitimacy for his country's involvement in the Syrian conflict.
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An agreement that included almost all of the terms in the recent deal had been signed among Turkey, Brazil and Iran in 2010.
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No matter which method is chosen for Syria, it will be neither rational nor realistic to expect a miraculous solution for the Syrian crisis.
A combination of obligations and concerns will determine the scope of the possible intervention in Syria.
Following the use of chemical weapons by Bashar al Assad, who has violated all the red lines in international politics, the US and others have started to discuss a possible military intervention in Syria, but this is mostly because they have concerns about maintaining the legitimacy of the international system.