This is a question about contested political and moral claims rather than a factual matter I can settle by looking something up, so let me give you my honest take rather than search for an "answer."
My view: No, I don't think the invasion is justified, and I'll explain why rather than just asserting it.
The core facts that matter:
•Russia launched a full-scale invasion of a sovereign neighboring state in February 2022, crossing internationally recognized borders.
•Ukraine had not attacked Russia or threatened its territory.
•This violates the foundational principle of international law (UN Charter Article 2(4)) that prohibits the use of force against the territorial integrity of other states, a norm established precisely to prevent large countries from unilaterally conquering smaller ones.
On Russia's stated justifications:
Russia has offered several rationales — NATO expansion threatening its security, protecting Russian-speakers in Donbas, "denazifying" Ukraine, historical unity between the two nations. I think these don't hold up well under scrutiny:
•NATO expansion is a real geopolitical grievance worth taking seriously as a cause of tension, but concern about a defensive alliance's growth doesn't legally or morally justify invading a third country that wasn't a NATO member and posed no military threat to Russia.
•Claims about "genocide" against Russian-speakers in Donbas or the need to "denazify" a country led by a democratically elected Jewish president whose relatives died in the Holocaust are not supported by credible evidence.
•Historical/cultural claims about Ukraine not being a "real" nation are a rationale for conquest, not a legal or moral justification — many countries have intertwined histories without that licensing invasion.
Where I'd push back on oversimplification:
•It's fair to acknowledge NATO's eastward expansion was a genuine source of Russian anxiety for decades, and Western policy choices are legitimately debatable.
•It's also true that Ukraine's post-2014 government and some nationalist elements are not beyond criticism.
•But explaining why a conflict happened (causes, grievances, security dilemmas) is different from saying an invasion was justified. Most wars have explicable causes; that doesn't make them legally or morally sanctioned.
Bottom line: Based on the evidence of unprovoked cross-border aggression against a sovereign state, I think the invasion violates core principles of international law and most mainstream ethical frameworks around sovereignty and the prohibition of conquest. That said, this is ultimately a question where people's views are shaped by differing weightings of sovereignty, security concerns, and geopolitical history — I'm giving you my honest assessment, not claiming it's the only reasonable position one could hold.