Is Russia's invasion of Ukraine justified?

Short answer: No. Under international law, Russia’s full‑scale invasion of Ukraine on February 24, 2022 is an unlawful use of force and not justified.

Why:

•The UN Charter prohibits the use of force against another state’s territorial integrity or political independence. The only narrow exceptions are Security Council authorization or self‑defense after an armed attack; neither applies here. There was no Security Council authorization, and Russia was not under an armed attack by Ukraine.[1]

•Russia claimed self‑defense and invoked treaties with the so‑called Donetsk and Luhansk “people’s republics,” plus “denazification” and preventing “genocide.” These are the government’s stated rationales, but they do not create a lawful basis to invade another UN member state. Collective self‑defense under Article 51 requires an armed attack and applies to states; and “denazification” or broad security concerns are not recognized legal justifications for aggression.[2]

•The International Court of Justice, in provisional measures on March 16, 2022, rejected Russia’s genocide pretext and ordered Russia to “immediately suspend” its military operations in Ukraine.[3]

•The UN General Assembly, by overwhelming votes, condemned the invasion (141–5–35 on March 2, 2022) and later condemned Russia’s attempted annexations of Ukrainian regions as illegal (143–5–35 on October 12, 2022). While not legally binding like Security Council decisions, these resolutions reflect the near‑universal view of the invasion as unlawful aggression.[4]

Separate from whether the war is fought lawfully (jus in bello), the decision to invade (jus ad bellum) is widely deemed illegal and unjustified under the UN Charter framework.[1]

If you’d like, I can break down the legal tests for self‑defense and why Russia’s arguments fail each step, or summarize the key UN and court documents in plain language.

Citations (4)

1un.orgGovernment
Chapter I: Purposes and Principles (Articles 1-2) | United Nations
Backs: “There was no Security Council authorization, and Russia was not under an armed attack by Ukraine.”
2un.orgGovernment
United Nations
Backs: “Collective self‑defense under Article 51 requires an armed attack and applies to states; and “denazification” or broad security concerns are not recognized legal justifications for aggression.”
3un-icc.cloudGovernment
Order of 16 March 2022
Backs: “The International Court of Justice, in provisional measures on March 16, 2022, rejected Russia’s genocide pretext and ordered Russia to “immediately suspend” its military operations in Ukraine.”
4un.orgGovernment
General Assembly Overwhelmingly Adopts Resolution Demanding Russian Federation Immediately End Illegal Use of Force in Ukraine, Withdraw All Troops | Meetings Coverage and Press Releases
Backs: “While not legally binding like Security Council decisions, these resolutions reflect the near‑universal view of the invasion as unlawful aggression.”