Incorrect. Just as it's relevant to Iranian interests when the US interferes with Iraq (and vice versa), the invasion of a country puts nearby countries on high alert (if not outright alarm). Nearby countries being in, or at least relevant to the EU in terms of things like economy (import / export, not currency) and so on, means it is a matter of interest. Nobody said "obligation", for the record. But Russia invading a country in Eastern Europe? Yes, that's relevant to Europeans, almost by definition.
Not to forget that Russian demands included NATO withdrawing troops from member states who joined since 1997. It wasn't just Ukraine who were threatened but the whole of what used to be within the USSRs sphere of influence.