Disclaimer: I am not pro-Russia just because I am not pro-Ukraine. To me this is a war between NATO imperialists/Ukrainian Nazis and a modern Capitalist Russian oligarchy. There is no good side in this war.
That being said, seeing support for Ukraine from people who didn't even know the country existed a couple of years ago always makes me roll my eyes. It comes across as shallow virtue signalling (even though I hate that term).
Compare it to people who support Palestine. People who support Palestine understand the history of that conflict and that it goes back to many many years of genocide on Israel's part.
People who support Ukraine typically know nothing of the history of the region, it's support for Nazis, it's pogroms, etc.
Even worse, sometimes they do know, they just don't care. 
The best part of when these people still think Russia communist. So crazy how many people have reverted to the same 50s' red scare hysteria that people used to make fun of.
Everybody starts out inundated with liberal propaganda and concept framing. You read the articles about these scary armed separatists and the people they've killed, and why they're so unreasonable to not be accepting the Legally and Internationally Recognized State And Borders™.
For anyone who digs a bit deeper, and has a tightly-held value of self-determination, they notice that the separatist areas are overwhelmingly Russian-speaking, had very distinct and persistent voting patterns compared to the northwest of the country, and didn't have the same historical connections or associations with the rest of Ukraine. That's when the narrative starts to peel apart, and there's room to wonder "what if they're not aggressors, what if they had legitimate concerns all along". Add in a bit of great power conflict analysis and it clicks.