No you must understand any nation Russia fights is imperialist because they are fighting Russia. It's very simple

You're saying that every single border dispute is imperialism. You do realize that this is a ridiculous position, right? Russia did not invade Ukraine to steal land. Russia has repeatedly submitted documentation and evidence for a humanitarian intervention in the Donbas on the same basis the UN has approved other such interventions - ethnic cleansing. Further, the border between Russia and Ukraine was only defined 30 years ago. It is definitely not true that the Donbas region is indigenously Ukrainian, as clearly the ethnic Russians there were under attack. Again, border conflicts are not imperialism.

As for fighting the imperialist war machine, Russia's stated reason for an expansion and full scale invasion of the border region was NATO activity. You can read NATO's own documents about its collaboration with Ukraine and development of integrated readiness exercises that simulated invasions of Kaliningrad and nuclear readiness. These started in the late fall of 2013, a couple months before the US was on the ground for EuroMaidan. Ukranian integration in NATO exercises expanded from that point forward.

And further, in essence the only countries that supported the Ukraine war effort were the Western imperial forces. In a proxy war, that's pretty telling. Ukraine is a proxy for the West. Russia and the Western imperialist are in a conflict and the West is using Ukraine as their proxy. Ergo, the conflict is between Russia and the imperialists via Ukraine.