The Russian separatists were and are directly lead by Russian military personell, pictures have been taken that show the same people among the separatists in Crimea and other ex Russian republics where Russia is very active. The same people are known to work directly for and under Russian command. Those are facts and widely agreed by intelligence services around the world.
Are you doubting that Russia takes a direct interest in Crimea and supplies separatists with weapons and intelligence? It takes a lot of imagination to belive some separatists shoot down commercial airliners without Russian knowledge and even approval.
So you draw a direct line between the shooting down of the plane right to Putin.
Do you draw a direct line between the slaughter of Syrian civilians right to Obama? Did Obama direct them to slaughter the civilians?
edit:
Ok, since you feel the need to edit your posts, so will I.
Since they were regime forces that slaughtered Syrian civilians, do you think they did it without Obama's direct knowledge and approval?