We're being overrun by barbarian immigrants

My fellow Romans, backward Germanic and Slavic barbarians are overrunning our lands, raping our women and taking our jobs. These barbarians fanatically worship the old gods or believe in christian herecies. They refuse to integrate and keep speaking in their own tongues. The authorities have declared many regions with high percentage of Germans to be no-go zones. What should we do about this situation?

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The Rooskiz are Orthodox christians and at one point a vassal state of the Byzantines. The Ottomans were a conglomeration of turkic tribes, the same people who had been attacking and pillaging Byzantium for 700 years, the Ottomans themselves had been ass raping the Byzantines and their allies for nearly 200 years by the time they Conquerred Constantinople. So there is no way they can claim to be Rome 3.