The Chechen wars were waged by both Boris Yeltsin and Vladimir Putin. The Chechens wanted independence from Russia. They killed numerous civilians in terrorist attacks throughout Russia. Yeltsin lost the first Chechen war and granted limited autonomy to the Chechens.
The terrorism continued,Putin took over and attacked them again. He beat them decisively and the war became a long terrorist insurgency that killed tens of thousands of civilians on both sides.
Putin stamped out the insurgency by leveling Grozny and killing the terrorists wherever they were found in Russia proper.
The war ended with a Russian victory, but Grozny was totally destroyed and the Chechen landscape became a mine infested wasteland of ecological disaster.
I don't know what to draw from these facts except to say the war in Ukraine should end now before it becomes far bloodier and more destructive then the Chechen wars were.
Putin won't back off. This will go to the limit.
I fear world war given the Western interests involved.
Only the Islamic culture and remote location prevented a similar catastrophe from happening in Chechnya.
The West considered it a Russian internal affair.
They would be wise to view Ukraine likewise in my opinion.
The alternative is world war.