You are spot on with your conclusion that Russia WANTS an unstable Meddle East, one that would seriously impact the transport of oil from that region, as that would leave Russia, a large oil producer and exporter itself, with a windfall as the market would look to Russia to cover the deficit. Russia would make out like a bandit.
Who is Pakistan and Saudi Arabia's biggest victims of the world wide jihad? Nuclear powers Russia and India and both Russia and India would not mind a nuclear powered Shia Iran being a problem for the Saudis and the Pakis.