Short answer: No. Under international law, Russia’s full‑scale invasion of Ukraine on February 24, 2022 is not justified.
Why not, legally
•Prohibition on force: The UN Charter forbids the threat or use of force against the territorial integrity or political independence of any state unless the Security Council authorizes it or a state is acting in self‑defense after an armed attack. Neither condition was met. Russia received no Security Council authorization, and Ukraine had not launched an armed attack on Russia.[1]
•Self‑defense claim: Russia told the UN it acted under Article 51, including “collective self‑defense” of the Donetsk and Luhansk entities. But claims of anticipatory self‑defense against vague future threats don’t satisfy the Charter’s standard, and “collective” self‑defense requires a request from a state victim of an armed attack—entities Russia had just unilaterally recognized are not widely regarded as states.[2]
•“Genocide prevention”/humanitarian rationale: The International Court of Justice, in provisional measures on March 16, 2022, found no plausible legal basis under the Genocide Convention for Russia to use force and ordered Russia to suspend military operations.[3]
•International response: On March 2, 2022, the UN General Assembly condemned the aggression and demanded Russia withdraw, with a vote of 141–5–35; on October 12, 2022, it condemned Russia’s attempted annexations of four regions and again demanded withdrawal (143–5–35). These are powerful indicators of the prevailing view of unlawfulness.[4]
•Ongoing UN stance: On February 23, 2023, the General Assembly reaffirmed Charter principles for a “comprehensive, just and lasting peace in Ukraine” and emphasized accountability (vote 141–7–32).[5]
Common arguments and why they fail legally
•NATO expansion/security concerns: Per the Charter, perceived future threats or geopolitical grievances do not permit invading another sovereign state.[1]
•Invitation by “DPR/LPR”: Assistance on a state’s territory requires that state’s consent; unilateral recognition of secessionist entities does not lawfully create that consent, and the General Assembly rejected the annexation/recognition moves.[6]
•Humanitarian intervention: There was no Security Council mandate, and the ICJ rejected genocide‑prevention as a basis for this use of force.[7]
Accountability efforts
•The International Criminal Court has issued arrest warrants for President Vladimir Putin and Maria Lvova‑Belova in connection with unlawful deportation of Ukrainian children—separate from jus ad bellum, but underscoring international condemnation of how the war is being waged.[8]
If you’d like, I can also walk through moral or strategic arguments people raise on each side, but legally, the invasion is widely judged to violate the UN Charter and is not justified.[4]
Backs: “But claims of anticipatory self‑defense against vague future threats don’t satisfy the Charter’s standard, and “collective” self‑defense requires a request from a state victim of an armed attack—entities Russia had just unilaterally recognized are not widely regarded as states.”
Backs: “The International Court of Justice, in provisional measures on March 16, 2022, found no plausible legal basis under the Genocide Convention for Russia to use force and ordered Russia to suspend military operations.”
Backs: “On February 23, 2023, the General Assembly reaffirmed Charter principles for a “comprehensive, just and lasting peace in Ukraine” and emphasized accountability (vote 141–7–32).”
Backs: “Assistance on a state’s territory requires that state’s consent; unilateral recognition of secessionist entities does not lawfully create that consent, and the General Assembly rejected the annexation/recognition moves.”
Backs: “The International Criminal Court has issued arrest warrants for President Vladimir Putin and Maria Lvova‑Belova in connection with unlawful deportation of Ukrainian children—separate from jus ad bellum, but underscoring international condemnation of how the war is being waged.”