Unilrteral Declaration of Independence from the Russian Federation was unconstitutional action, which resulted in an armed conflict between Russia and separatists.
The same when Croatia declared a unilateral independence from Yugoslavia, which was unconstitutional and it resulted in a massive war.
The same goes for Kosovo .
The fact in all those scenarios is that separatist in each one of those countries declared a unilateral independence, which is unconstitutional and the government of every country mentioned did everything to stop it.
Chechnya was internationally recognized as a part of Russia back then as it is today. What is so hard to understand?
