Uhhh Germany, you don’t get to rule Europe, like your pal Adolf wanted to.
Admit enough Muslims, and Germany won’t be ruling Europe, either. Not unless there is a massive conversion of Germans to Islam, then it shall be the worst of all worlds. Islamic Germans would bring order and regimentation to Islam, rather than the loose and casual interpretation the Turks, Arabs, and Farsi now apply to carrying out the postulates of the faith as outlined in the Koran. Islamic Germans would REALLY enforce the spirit of Shari’ah law, none of this “if we catch you” stuff the current “authorities” on Shari’ah law now practice. There will be very sharp discernment of Thoughtcrime and Apostasyintent, which will have maximum penalties applied on the spot.
The sons of Wodin converted to Islam could turn on the Russian Federation and very likely prevail. And there is no more formidable warrior than a convert to the “religion” of Islam, who is filled with righteous rage and eons of resentments built up against enemies so ancient, nobody knows what the original source of disagreement was.
Germans hate Russians anyway, with a vengeance of long standing, no matter how many treaties and trade agreements may have been signed in the past. Treaties mean jack to Muslims, unless the other side is backed up with sufficient military might and the will to use it, and then the treaty would not have been necessary.