Not a brilliant or thoughtful comment. Native Russian immigration into Germany happened with the USSR and came with the reunification of East and West after the dissolution of the USSR, not recently. They are still one of the two biggest minorities, likely behind Turkey. 

Then there is the fact that there are already far more Muslims in Russia (10mm - low estimate) than Germany (4.7mm - high estimate)

https://en.wikipedia.org/wiki/Islam_by_country

Syria is currently #3  after Turkey and Poland as the source of immigrants to Germany. Poles are generally not big fans of Muslim immigration.

https://en.wikipedia.org/wiki/Immigration_to_Germany