Are you saying Russia is concerned about Muslim takeover of Europe?
In parts of Europe, yes.
Observe Russia's reaction to the Clintoon NATO war against the Serbs and the Islamization of Kosovo, they were NOT happy.
Observe the Putin engineered punishment of Georgia (identical justification as Serbia) where Russia demonstrated what happens if you have an interest in joining NATO (Georgia; Ukraine) and wish to kiss Western European ass.
Observe how Putin has Chechnya on the barbecue.
Still, it is really about the Russian Empire and how all Europe will be a part of it. The Western European states will just have to suffer their Muslims as well as Russia, or they could send their infidels to fight to protect Muslims, if they wish.
What say you Ernie?