Is Russia's invasion of Ukraine justified?

The question of whether Russia's invasion of Ukraine is justified is a central issue in modern international relations, international law, and global ethics. There is a deep divide between the justifications presented by the Russian government and the overwhelming consensus of the international community, international legal bodies, and Ukraine itself.

The primary arguments from both sides outline how the conflict is viewed.

Justifications Presented by the Russian Government

The Russian government, led by President Vladimir Putin, has presented several arguments to justify its military actions, which it officially terms a "special military operation". These justifications center on national security, historical ties, and humanitarian claims:

1.Opposition to NATO Expansion: Russia argues that the eastward expansion of the North Atlantic Treaty Organization (NATO)—specifically the prospect of Ukraine joining the alliance—poses an existential threat to its national security. The Kremlin contends that Western powers broke informal promises made at the end of the Cold War not to expand NATO eastward, and that a heavily armed, NATO-aligned Ukraine on Russia’s border is unacceptable.

2.Protection of Russian-Speakers in Donbas: Putin claimed that the invasion was necessary to protect the Russian-speaking populations in Ukraine’s eastern Donbas region (specifically the self-proclaimed Luhansk and Donetsk People's Republics) from what he characterized as "genocide" and systemic persecution by the Ukrainian government.

3."Demilitarization and Denazification": The Russian leadership has argued that Ukraine’s post-2014 government is controlled by far-right, anti-Russian, and "neo-Nazi" elements. Russia claimed its military intervention was aimed at "demilitarizing" and "denazifying" Ukraine to secure long-term peace.

4.Historical and Cultural Unity: In official speeches and essays, Putin has argued that Russians and Ukrainians are "one people" and that Ukraine is historically, culturally, and spiritually inseparable from Russia. From this perspective, the current borders of Ukraine are viewed as artificial products of the Soviet collapse.

5.Critique of Western Unilateralism: Russia has pointed to past military interventions by Western nations—such as the NATO bombing of Yugoslavia in 1999 and the 2003 invasion of Iraq—to argue that Western condemnation of its actions is hypocritical and that the U.S.-led international order is applied selectively.

Arguments Against the Invasion (The International Consensus and Ukraine's Position)

The overwhelming majority of countries, international bodies, and legal scholars reject Russia's justifications, viewing the invasion as an unprovoked and illegal act of aggression. Their arguments include:

1.Violation of International Law and the UN Charter: Critics point out that the invasion blatantly violates Article 2(4) of the United Nations Charter, which prohibits member states from using force against the territorial integrity or political independence of any state. Because Ukraine is a sovereign nation, any military invasion without United Nations Security Council approval or a valid claim of self-defense is considered a crime of aggression under international law.

2.Rejection of the "Self-Defense" Claim (Article 51): Under Article 51 of the UN Charter, nations have the right to self-defense only if an armed attack occurs against them. Legal experts and the UN note that Ukraine had not attacked, nor did it threaten to attack, Russian territory. Furthermore, because the separatist regions of Donetsk and Luhansk were not recognized as independent states under international law, Russia could not legally claim "collective self-defense" on their behalf.

3.Lack of Evidence for "Genocide": Independent international organizations, including the United Nations Human Rights Council, have found no evidence to support Russia's claims of "genocide" against Russian-speakers in eastern Ukraine. The International Court of Justice (ICJ) subsequently ordered Russia to suspend its military operations, finding no legal basis for Russia's use of the Genocide Convention as a pretext for the invasion.

4.Respect for Sovereignty and Self-Determination: Opponents emphasize that Ukraine is an independent, sovereign state whose borders were internationally recognized upon the dissolution of the Soviet Union in 1991—a sovereignty Russia formally committed to respect in the 1994 Budapest Memorandum. As a sovereign nation, Ukraine has the right to choose its own foreign policy, security alliances, and domestic leadership without interference from neighboring powers.

5.Rejection of "Denazification" Claims: The international community has widely dismissed the "denazification" narrative as propaganda. While Ukraine, like many European nations, has small far-right political factions, they have historically won negligible percentages of the vote in democratic elections. Furthermore, Ukraine’s president, Volodymyr Zelenskyy, is Jewish and had family members who died in the Holocaust.

6.Condemnation by the UN General Assembly: The political consensus of the global community was demonstrated when the UN General Assembly voted overwhelmingly (with 141 countries in favor of the resolution) to condemn the invasion and demand the immediate, complete, and unconditional withdrawal of Russian forces. Subsequent resolutions also declared Russia's attempted annexations of Ukrainian territory to be illegal and invalid under international law.

Conclusion

While the Russian government frames the invasion as a necessary, defensive measure to counter Western expansion, protect Russian-speakers, and reclaim historic territories, the vast majority of the international community—including the United Nations, international courts, and legal scholars—regards the invasion as unjustified, a flagrant violation of international law, and a threat to the global security order.

Citations (9)

1claremont.eduAcademic
claremont.edu
Backs: “The Russian government, led by President Vladimir Putin, has presented several arguments to justify its military actions, which it officially terms a "special military operation".”
2ntnu.noNot yet classified
ntnu.no
Backs: “The Russian government, led by President Vladimir Putin, has presented several arguments to justify its military actions, which it officially terms a "special military operation".”
3cfr.orgNonprofits and think tanks
cfr.org
Backs: “Protection of Russian-Speakers in Donbas: Putin claimed that the invasion was necessary to protect the Russian-speaking populations in Ukraine’s eastern Donbas region (specifically the self-proclaimed Luhansk and Donetsk People's Republics) from what he characterized as "genocide" and systemic persecution by the…”
4rsisinternational.orgAcademic
rsisinternational.org
Backs: “Historical and Cultural Unity: In official speeches and essays, Putin has argued that Russians and Ukrainians are "one people" and that Ukraine is historically, culturally, and spiritually inseparable from Russia. From this perspective, the current borders of Ukraine are viewed as artificial products of the Soviet…”
5inss.org.ilAcademic
inss.org.il
Backs: “The overwhelming majority of countries, international bodies, and legal scholars reject Russia's justifications, viewing the invasion as an unprovoked and illegal act of aggression. Their arguments include:”
6cambridge.orgAcademic
cambridge.org
Backs: “The overwhelming majority of countries, international bodies, and legal scholars reject Russia's justifications, viewing the invasion as an unprovoked and illegal act of aggression. Their arguments include:”
7icds.eeNonprofits and think tanks
icds.ee
Backs: “The overwhelming majority of countries, international bodies, and legal scholars reject Russia's justifications, viewing the invasion as an unprovoked and illegal act of aggression. Their arguments include:”
8wikipedia.orgEncyclopedias and referencequality 0.83
wikipedia.org
Backs: “Because Ukraine is a sovereign nation, any military invasion without United Nations Security Council approval or a valid claim of self-defense is considered a crime of aggression under international law. Rejection of the "Self-Defense" Claim (Article 51): Under Article 51 of the UN Charter, nations have the right to…”
9securitycouncilreport.orgNonprofits and think tanks
securitycouncilreport.org
Backs: “Subsequent resolutions also declared Russia's attempted annexations of Ukrainian territory to be illegal and invalid under international law. Conclusion”