Is Russia's invasion of Ukraine justified?

Short answer: No.

Why

•International law: The UN Charter prohibits the threat or use of force against another state except in self‑defence against an armed attack or with Security Council authorization. Russia had neither a UN mandate nor a qualifying armed attack to justify invading Ukraine on February 24, 2022.[1]

•“Self‑defence” claims: Under ICJ case law, self‑defence requires an actual armed attack; dissatisfaction with another state’s alliances or speculative threats doesn’t qualify. Russia’s recognition of Donetsk/Luhansk and claims of “collective self‑defence” don’t create a legal basis to use force in Ukraine.[2]

•“Preventing genocide” claim: In March 2022, the International Court of Justice ordered Russia to immediately suspend its military operations in Ukraine and found no basis for Russia’s genocide pretext at that stage of the case.[3]

•Global response: The UN General Assembly has repeatedly condemned the invasion and demanded Russia withdraw its forces, including on March 2, 2022 (“Aggression against Ukraine”) and on October 12, 2022 (condemning attempted annexations).[4]

•Conduct of the war: International bodies have documented grave violations and alleged war crimes; the International Criminal Court has issued arrest warrants, including for President Vladimir Putin, related to unlawful deportation of Ukrainian children. While these do not determine jus ad bellum, they underscore the invasion’s unlawfulness and harm.[5]

If you want, I can walk through Russia’s stated arguments one by one and show how international law treats each.

Citations (5)

1un.orgGovernment
United Nations Charter (full text) | United Nations
Backs: “Russia had neither a UN mandate nor a qualifying armed attack to justify invading Ukraine on February 24, 2022.”
2icj-cij.orgGovernment
Military and Paramilitary Activities in and against Nicaragua (Nicaragua v. United States of America) - Judgment of the Court | INTERNATIONAL COURT OF JUSTICE
Backs: “Russia’s recognition of Donetsk/Luhansk and claims of “collective self‑defence” don’t create a legal basis to use force in Ukraine.”
3icj-cij.orgGovernment
Order of 16 March 2022 | INTERNATIONAL COURT OF JUSTICE
Backs: “In March 2022, the International Court of Justice ordered Russia to immediately suspend its military operations in Ukraine and found no basis for Russia’s genocide pretext at that stage of the case.”
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: “The UN General Assembly has repeatedly condemned the invasion and demanded Russia withdraw its forces, including on March 2, 2022 (“Aggression against Ukraine”) and on October 12, 2022 (condemning attempted annexations).”
5icc-cpi.intGovernment
Ukraine | International Criminal Court
Backs: “While these do not determine jus ad bellum, they underscore the invasion’s unlawfulness and harm.”