Is Russia's invasion of Ukraine justified?

Short answer: No. Under international law, Russia’s 24 February 2022 full‑scale invasion violates the UN Charter’s ban on the threat or use of force against another state’s territorial integrity or political independence, and it fits neither recognized exception (Security Council authorization or self‑defense against an armed attack).[1]

What the international bodies say

•The UN General Assembly has repeatedly condemned the invasion as aggression and demanded Russia withdraw (141–5–35 on March 2, 2022; 143–5–35 on October 12, 2022 regarding attempted annexations; and 141–7–32 on February 23, 2023 reaffirming Charter principles and Ukraine’s territorial integrity).[2]

•The International Court of Justice ordered Russia on March 16, 2022 to suspend its military operations and found no evidence supporting Russia’s genocide claims used to justify force; in 2024 the Court confirmed it has jurisdiction to adjudicate Ukraine’s request for a declaration that Ukraine did not commit genocide in Donetsk/Luhansk.[3]

•The General Assembly also declared Russia’s attempted annexations of Donetsk, Kherson, Luhansk and Zaporizhzhia invalid and illegal.[4]

On Russia’s stated justifications

•Preventing “genocide”/humanitarian intervention: The ICJ said it had no evidence Ukraine was committing genocide and ordered Russia to halt operations; unilateral “humanitarian intervention” is not an accepted legal ground for invading another state.[3]

•Self‑defense (including “collective” self‑defense of separatist entities or pre‑emptive defense against NATO): Article 51 permits self‑defense only “if an armed attack occurs.” Claims of anticipatory or pre‑emptive self‑defense are not generally accepted to justify launching a major invasion, and secessionist entities lack the standing of UN member states for collective defense.[5]

Related but separate: the conduct of the war

•The International Criminal Court has issued arrest warrants (e.g., for President Vladimir Putin and Maria Lvova‑Belova) over the unlawful deportation/transfer of Ukrainian children—alleged war crimes. While this speaks to how the war is being fought (jus in bello), it reinforces the broad international view that the invasion is unlawful and unjustified.[6]

If you’d like, I can summarize the main legal arguments Russia advances and how international legal scholars assess each in more detail.

Citations (6)

1un.orgGovernment
United Nations Charter (full text) | United Nations
Backs: “Under international law, Russia’s 24 February 2022 full‑scale invasion violates the UN Charter’s ban on the threat or use of force against another state’s territorial integrity or political independence, and it fits neither recognized exception (Security Council authorization or self‑defense against an armed attack).”
2un.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: “143–5–35 on October 12, 2022 regarding attempted annexations; and 141–7–32 on February 23, 2023 reaffirming Charter principles and Ukraine’s territorial integrity).”
3icj-cij.orgGovernment
Order of 16 March 2022 | INTERNATIONAL COURT OF JUSTICE
Backs: “The International Court of Justice ordered Russia on March 16, 2022 to suspend its military operations and found no evidence supporting Russia’s genocide claims used to justify force; in 2024 the Court confirmed it has jurisdiction to adjudicate Ukraine’s request for a declaration that Ukraine did not commit genocide…”
4un.orgGovernment
With 143 Votes in Favour, 5 Against, General Assembly Adopts Resolution Condemning Russian Federation’s Annexation of Four Eastern Ukraine Regions | Meetings Coverage and Press Releases
Backs: “The General Assembly also declared Russia’s attempted annexations of Donetsk, Kherson, Luhansk and Zaporizhzhia invalid and illegal.”
5un.orgGovernment
Chapter VII: Article 51 — Charter of the United Nations — Repertory of Practice of United Nations Organs — Codification Division Publications
Backs: “Article 51 permits self‑defense only “if an armed attack occurs.” Claims of anticipatory or pre‑emptive self‑defense are not generally accepted to justify launching a major invasion, and secessionist entities lack the standing of UN member states for collective defense.”
6icc-cpi.intGovernment
Situation in Ukraine: ICC judges issue arrest warrants against Vladimir Vladimirovich Putin and Maria Alekseyevna Lvova-Belova | International Criminal Court
Backs: “While this speaks to how the war is being fought (jus in bello), it reinforces the broad international view that the invasion is unlawful and unjustified.”