Is Russia's invasion framed as justified? I'll lay out the competing legal and historical claims.
Russia's full-scale invasion of Ukraine on 24 February 2022 is widely considered illegal and unjustified under international law, though Russia has offered several official justifications.
1. Russia's stated justifications
In his televised address on 23-24 February 2022 announcing a "special military operation," President Vladimir Putin gave several reasons:
•Protection of people in Donbas: To defend Russian-speaking territories in eastern Ukraine — the Donetsk People's Republic and Luhansk People's Republic — under Article 51 of the United Nations Charter. He claimed that Russian military intervention was necessary to "protect people who have been subjected to abuse and genocide" by the Ukrainian government.
•Allegations of genocide and "denazification": Putin claimed that Ukraine had been committing genocide against Russian speakers in the region; that Ukraine's government were neo-Nazis under Western control, and that the aims included "demilitarisation and denazification of Ukraine". The operational goals were cited as demilitarization and denazification coupled with accusations of neo-Nazi governance.
•Collective self-defense of DPR/LPR: That the people's republics of Donbas had requested help, and in accordance with Article 51 and treaties with the Donetsk and Luhansk Republics he decided to conduct the operation.
•NATO security threat: That possibility of Ukraine joining NATO and possibility of deployment of US/NATO missiles in Ukraine threatened Russia. He said NATO was building up military infrastructure in Ukraine, threatening Russia, described Ukraine becoming an "anti-Russia" state supplied with modern weapons, and that as NATO expands to the east the situation for Russia is getting worse.
•Protection of Russian speakers more broadly: Russian propaganda used the protection of Russian speakers as one of the justifications, with statements such as "Russia could not but come to the rescue of the long-suffering people of Donbass".
The geopolitical context often cited by Russia and some analysts is the expansion of NATO since the fall of the Soviet Union — 11 former Soviet republics or Warsaw Pact members have joined NATO — which Russia considers a threat to national security, including NATO missiles in Poland, Romania and the Baltics.
2. International legal assessment
The prevailing view among states and international legal experts is that none of those arguments provide a lawful justification:
•UN Charter prohibition on use of force: Since the beginning, the invasion has been described as violating international law including the Charter of the United Nations.
Article 2(4) of the UN Charter states, "All Members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state". Similarly, Article 2(4) provides that members "shall refrain ... from the threat or use of force against the territorial integrity or political independence of any state". The UN Charter's only two exceptions are self-defense and authorization by the Security Council.
•Rejection of self-defense claim: Russia has argued its use of force is lawful under Article 51 to defend Donetsk and Luhansk. Experts criticized this, arguing Russia cannot rely on self-defense because Ukraine has not threatened or attacked another nation, and because these regions are not recognized as separate states under international law. Analysts also note Article 51 allows aid to another UN member state, but the DPR and LPR were not UN member states and were only recognized by Russia, and that the right to self-defense applies mainly when an attack has already begun, not a blurred future NATO threat. There was "no legal justification under Article 51" and without self-defense the actions represent illegal aggression.
•Rejection of humanitarian/genocide justification: Experts have rejected the humanitarian justification as a pretext, unsubstantiated by any evidence that Ukraine committed acts against Russians in Donetsk and Luhansk that could amount to genocide. Putin's accusation that Ukraine was committing genocide has been widely rejected as baseless, over 300 scholars rejected Russia's abuse of the term, and the International Court of Justice said it had not seen any evidence of genocide committed by Ukraine.
•Rejection of comparison to Western interventions: Russia has tried to justify its invasion by comparing it to interventions by the US and allies in Kosovo, Iraq, Libya and Syria, but these comparisons have been dismissed as irrelevant because one illegal act does not make a different act legal, with scholars noting "even if [they were] true, one illegal use of force does not justify another".
•UN and state responses:
•The invasion has been described by officials as in flagrant breach of the UN Charter and by New Zealand as a blatant violation of international law, including the UN Charter: "It was illegal, unprovoked, and unjustified".
•The UN General Assembly passed a resolution deploring in the strongest terms the aggression by the Russian Federation against Ukraine in violation of Article 2(4), also immediately qualified as an act of aggression in violation of Article 2(4) on 2 March 2022.
•That resolution was passed with an overwhelming 141-5 vote majority, with 35 nations abstaining, with a similar tally of 141-5 with 35 abstentions reported elsewhere.
•The invasion was qualified as a crime of aggression under Article 8bis of the Rome Statute, defined as an act of aggression which by its character, gravity and scale constitutes a manifest violation of the Charter.
It also was assessed to violate other agreements to which Russia is a party, including the 1975 Helsinki Final Act and the 1994 Budapest Memorandum in which Russia agreed to respect Ukraine's independence, sovereignty and existing borders.
3. How justification is evaluated
Whether the invasion is considered "justified" depends on the framework used:
•Under international law (jus ad bellum): The overwhelming majority of UN member states, the UN General Assembly, the International Court of Justice interim order, and most international lawyers conclude there is no lawful justification — the various claims advanced by Russia not only all fail, but most fail on multiple grounds, constituting an unlawful use of force and act of aggression.
•From Russia's perspective: The government presents the action as defensive and protective — preventing a NATO-armed anti-Russia on its border and protecting Russian-speaking populations from alleged persecution.
Many analysts note that while concerns about NATO expansion, the failure to implement the Minsk II agreements, and the history of conflict in Donbas since 2014 are part of the political background, they do not under the UN Charter create a legal right to invade another sovereign state.
In short, Russia offers security and humanitarian justifications, but those justifications have been rejected as factually unsubstantiated and legally insufficient by the UN General Assembly and the broad consensus of international law.