Is Russia's invasion of Ukraine justified?

This is a question about a matter of significant historical, legal, and political controversy, and I want to give you a well-grounded answer rather than just my opinion.

Under international law, the invasion is not justified. This is the near-universal assessment of international legal scholars and institutions:

•The UN Charter prohibits the use of force against the territorial integrity of another state (Article 2(4)), with narrow exceptions for self-defense against an actual or imminent armed attack, or UN Security Council authorization. Neither applied in February 2022.

•The UN General Assembly voted overwhelmingly (141-5) in March 2022 to condemn the invasion as a violation of Ukraine's sovereignty and territorial integrity.

•The International Court of Justice and International Criminal Court have both taken actions consistent with treating the invasion, and associated conduct, as violations of international law (the ICC issued an arrest warrant for Putin over alleged war crimes).

Russia's stated justifications — including claims of NATO threat, protection of Russian-speakers/ethnic Russians in Donbas, "denazification," and historical claims that Ukraine isn't a legitimate separate nation — are rejected by the overwhelming majority of international legal scholars as not meeting the legal threshold for self-defense or humanitarian intervention under the UN Charter. Claims of genocide against Russian-speakers in Donbas, cited by Russia as justification, have not been substantiated by independent investigations, including a ruling from the ICJ.

Where there is legitimate debate is not whether the invasion is legal, but on adjacent questions people sometimes conflate with justification:

•Whether NATO expansion was a wise or provocative policy choice (a strategic/historical debate, separate from whether it legally justified invasion)

•Whether Western/Ukrainian policy choices after 2014 (Crimea annexation, Minsk agreements, Donbas conflict) could have been handled differently to avoid war

•Broader debates about great-power spheres of influence versus small-state sovereignty

These are legitimate historical and policy debates, but they are distinct from the legal question of whether invading a sovereign neighbor is justified — on that narrower legal question, the consensus among international law experts, the UN, and most governments worldwide is that it is not.

If you're interested in digging into any particular piece of this — the NATO expansion debate, the legal self-defense arguments Russia has made, or how this compares to other historical interventions — I'm happy to go deeper on any of those threads.

Is Russia's invasion of Ukraine justified?

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