After the Great Schism, the Byzantine empire became weak and started declining. Turkish invasions slowly weakened the empire. The Seljuk Turks started capturing and overthrowing the power of provincial rulers. This led to the cutting off of taxes to the Byzantine empire. Slavic kingdoms rose to power in the Balkans. As the Byzantine empire called for help from the west, the west ignored calls and instead took Constantinople during the Crusades. With the external invasions, overtaxation, and a western feud, Byzantine Empire was left vulnerably weak. The Ottoman Turks finally took the empire, spreading Islam to the east. As the Byzantine Empire was fall, so were its neighbors in "Russia".