Goths, Vandals, Huns, Franks, Bulgars and others.
The western Roman Empire was less wealthy and harder to protect from invaders than the eastern Roman Empire
The Germanic peoples invaded the western part of the Roman Empire.
Christians from the West and Muslims from the East attacked the empire. Asia Minor was lost to these invaders. This greatly weakened the empire, which had depended on Asia Minor for food and materials as well as soldiers. Before long the Byzantine Empire was reduced to a small area around Constantinople.
ASSYRIANS
Internal political conflict at times weakened the empire's ability to fight against invasions, especially when they had to face two waves of invaders at the same time: the Arabs from the east (an later the Turks) and the Slavs from the north.
The Roman invaders were the Vandels, Visigoths, and the Huns
The Russian people attacked the Byzantine Empire
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Songahi
Yes, the Middle East attacked the Byzantine Empire, i.e. in the Levant. The Turks also attacked the Byzantine Empire.
Alexander the Great took over the Empire.
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