Both sides had the option to de-escalate. All Ukraine needed to do is to implement Minks agreements instead of killing ppl of donbass.

Had? Ukraine still has the option to capitulate and give up its territory, what kind of argument is that? Separatists who take up arms are a fair target, they are the ones violently changing the status quo. When both sides kill civilians in a war started by one side, that side's further escalation is not at all justified by "killing ppl of donbass", so let's not manipulatively paint a "both sides" picture as if there isn't a huge difference