Perhaps due to US distance from Europe and from Daesh movement can explain your words. Otherwise your words make no sense at all, and can be offensive to Russians who believe they are fighting the bad guys, despite supporting Bashar al-Assad.
Do not mistake Daesh for the Syrian regime. Daesh happens to be most active in Syria, but it is also active in other countries (and some with recent US "enforced" control like Iraq)
Vladimir Putin is not supporting them, he's fighting them on behalf of al-Assad - so we all share a common enemy here.
Now, if you say we shoud not be supporting al-Assad at all, you are right - and I can fully agree with you. But you are not understanding what's at stake here, and what role is played by each party. Stating "What could he have told Putin which, when relayed to ISIS, helped them organize the massacre?" as you did just makes you look ignorant on the eyes of those many who have to fight daesh and secure their borders as best as they can, while offering a safe shelter to those running away from the conflict.
Disclaimer: I am not Russian, nor am I fond of Russian government.