Caspian Sea = oil and gas. That's the reason people play games with our ethnicity. If they continue to drive a wedge between Iran and the province that was stolen (now called the Republic of Azerbaijan); they can continue to put billions in the oil dollars in the pockets of the elite.
Yes, but of Azaris live in Turkey also.
One of the basic principles of international law is that military action that leads to acquisition of territory or gaining of sovereignty is illegal.
If they disagree with this principle, the land can then be taken back by force.
Either way, it's Iranian land.