The problem is that western media doesnt report any of this, and if you believe in Guardian or any similar newspapers, you will remain ignorant of reality.

If you were to take a look at the Western media, you would see that all these things are actually being reported there. They tell you about the nazis in Donbass (1 2 3), the civilian casualties (1 2) or weapon supplies (1 2).

Russia has tried diplomacy for a long time, it was rejected, [...]

Forcing your interests on a sovereign country is diplomacy in bad faith at best. Putin is an ethno-nationalistic imperialist and it is beyond my understanding why leftists defend him so much (The enemy of my enemy is my friend, huh?)