To make it more clear, I want to figure it our for myself whether interventions in the past by the US supported by some European countries were any similar.
Unfortunately, I don't understand modern politics very well so it would be great to understand whether there is any bias these days towards some countries.
You clearly have no knowledge of things you are trying to talk about. This statement is purely emotional and has no substance in it.
To understand how "friendly" Ukraine is, try to dig what they have done for their western territories. Or how they blocked water to Crimea peninsula, causing humanitarian catastrophe.
We can certainly talk about how this may not justify what is happening now, but calling ukraine friendly is way of a stretch.
https://en.m.wikipedia.org/wiki/False_balance
Europe _definitely_ cares for Ukraine directly, but we also care about the larger security situation. A world where Putin invades countries on a whim is objectively bad for all countries (except for Russia _maybe_). Ukraine is protecting Democracy with the lives of their soldiers and brave civilians. I would be honored if Ukraine wants to join the EU after this.