The premise of this question, namely that Assyria was defeated by the Persians and/or Medes is incorrect. The Assyrian Empire was only ever defeated by the Babylonian Empire. These defeats were brought about by internal strife within the Assyrian Kingdom. The Persians were able to conquer Babylon and acquire the previously conquered Assyria.
Babylonians and Scythians.
Chaldeans, Medes, Sythians
The Chaldeans and The Medes joined forces to fight The Assyrians.
The Medes and the Babylonians conquered Assyria
They were brought down by the Babylonians with help from the Medes.
During this period, the Persians were tribes to the east of the Persian Gulf, under the control of the Medes. They were farmers living off their fields and flocks with negligible resources to trade with. It was only at the end of this period that they gained control of the Medes, took over Babylonia, Assyria and the Middle East, and became a trading power as well.
There was no Persian Empire in 650 BCE. The Persian tribe was tributory to the Medes until after 550 BCE.
The city of Assyria, specifically its capital Nineveh, was conquered by the Medes and Babylonians in 612 BCE. This marked the fall of the Assyrian Empire, which had been a dominant power in the ancient Near East. The coalition of these two groups effectively ended Assyrian dominance and led to the rise of new powers in the region.
The Persians and the Medes, under King Cyrus the Great.
The Persian empire began when Cyrus the Great led a revolt against the Medes.
No - Darius I was not a Mede, he was Persian. And Persians and Medes were not black, they were Indo-European.
Israel fell to Assyria in 722 BCE.