Is Russia's invasion of Ukraine justified?
The overwhelming consensus among international law scholars, the United Nations, and most of the global community is that Russia's 2022 invasion of Ukraine is not justified under international law. Here's the reasoning:
Why it's considered unjustified
Violation of the UN Charter: The UN Charter prohibits the use of force against the territorial integrity or political independence of any state, with narrow exceptions (self-defense against an actual armed attack, or UN Security Council authorization). Ukraine had not attacked Russia, and the Security Council did not authorize military action.
UN General Assembly condemnation: In March 2022, the UN General Assembly passed a resolution (with 141 countries in favor) demanding Russia withdraw and condemning the invasion as a violation of Ukraine's sovereignty and territorial integrity.
International Court of Justice and ICC: The ICJ ordered Russia to suspend military operations, and the International Criminal Court issued an arrest warrant for Vladimir Putin over alleged war crimes related to the deportation of children.
Russia's stated justifications and why they're widely rejected
Russia has offered several justifications, including:
Most legal scholars and governments reject these as insufficient to justify a full-scale invasion. Concerns about NATO expansion, even if genuine, don't provide a legal basis for armed aggression under international law—diplomatic and political means were available. Claims about "denazification" have been widely dismissed as pretextual, especially given Ukraine's democratically elected (and Jewish) president. The sovereignty of Ukraine to determine its own alliances and governance is a matter settled by international law regardless of historical ties.
A note on nuance
While the legal and moral consensus against the invasion is strong, reasonable analysts do debate related but distinct questions—such as the wisdom of NATO's post-Cold War expansion policy, the complexities of Donbas's pre-2022 conflict, or how the war should end. These are different from the question of whether the 2022 full-scale invasion itself was legally or morally justified, which has a much clearer answer: it was not, by the standards of international law as broadly recognized by the international community.
If you'd like, I can go deeper into any specific aspect—the legal arguments, the historical background, or how different countries/experts have responded.