The question of whether Russia’s invasion of Ukraine is justified is one of the most significant and contested geopolitical issues of the 21st century.
There is a stark division between the justifications presented by the Russian government and the overwhelming consensus of the international community, international legal bodies, and Ukraine itself, which reject those arguments and view the invasion as an illegal act of aggression.
Here is an overview of the key arguments and perspectives from both sides of the issue.
The Russian Government’s Justifications (The Kremlin’s Perspective)
The Russian government, led by President Vladimir Putin, has presented several rationales to justify what it officially termed a "special military operation" beginning in February 2022:
1.NATO Expansion and Security Concerns: Russia argues that the eastward expansion of NATO—specifically the prospect of Ukraine joining the military alliance—poses an existential threat to its national security. The Kremlin contends that Western powers reneged on verbal assurances made at the end of the Cold War not to expand NATO eastward, and that a heavily armed Ukraine allied with the West is a "red line" for Russian security.
2."Demilitarization" and "Denazification": Russian leadership claimed the invasion was necessary to "demilitarize" and "denazify" Ukraine. The Kremlin asserted that the Ukrainian government was controlled by far-right, neo-Nazi elements hostile to Russia and Russian culture.
3.Protection of Russian-Speakers in the Donbas: Moscow argued it had a duty to protect Russian-speaking populations in the eastern Ukrainian region of Donbas. Russia accused the Ukrainian government of committing "genocide" against these populations during the war that began in 2014 after the annexation of Crimea, and claimed the 2022 invasion was an act of self-defense on behalf of the self-proclaimed Donetsk and Luhansk People's Republics, which Russia recognized as independent just before the invasion.
4.Historical and Cultural Unity: In essays and speeches, Vladimir Putin has argued that Russians and Ukrainians are "one people" and that Ukraine’s modern borders are artificial, claiming that large portions of Ukrainian territory are historically Russian lands.
The Position of Ukraine and the International Community
The government of Ukraine, the United Nations, and the vast majority of the international community reject Russia’s justifications, characterizing the invasion as an unprovoked, illegal war of aggression. Their arguments include:
1.Violation of International Law and Sovereignty: Under Article 2(4) of the United Nations Charter, all member states must refrain from the threat or use of force against the territorial integrity or political independence of any state. The UN General Assembly has repeatedly passed resolutions by overwhelming majorities (such as Resolution ES-11/1) condemning the invasion as a violation of the UN Charter and demanding that Russia immediately and unconditionally withdraw its forces.
2.Right to Self-Determination: Ukraine and its allies argue that as a sovereign, independent nation, Ukraine has the right to determine its own foreign policy, alliances, and future—including seeking membership in the European Union or NATO—free from external vetoes or military coercion by neighboring states.
3.Rejection of "Genocide" and "Denazification" Claims: Independent international observers, historians, and organizations (including the UN and the International Court of Justice) have found no evidence to support Russia’s claims of "genocide" against Russian-speakers in Ukraine. Furthermore, international analysts point out that while Ukraine, like many countries, has far-right political fringes, they represent a tiny minority with virtually no power in mainstream Ukrainian politics, and the country's president, Volodymyr Zelenskyy, is Jewish and lost family members in the Holocaust.
4.The Budapest Memorandum: In 1994, Ukraine agreed to give up the world’s third-largest nuclear arsenal (which it inherited after the fall of the Soviet Union) in exchange for security assurances. Under the Budapest Memorandum, Russia, the United States, and the United Kingdom explicitly committed to respect Ukraine’s independence, sovereignty, and existing borders, and to refrain from the threat or use of force against it.
5.Rulings by International Courts:
•In March 2022, the International Court of Justice (ICJ)—the principal judicial organ of the UN—ordered Russia to immediately suspend its military operations in Ukraine.
•The International Criminal Court (ICC) has issued arrest warrants for Russian officials, including President Vladimir Putin, over alleged war crimes, specifically the unlawful deportation of children from Ukraine to Russia.
Conclusion
From the perspective of the Russian government, the invasion is framed as a preemptive, defensive measure to protect its national security against NATO encirclement and to defend Russian-speaking populations.
From the perspective of Ukraine and the international community, these claims are viewed as pretextual fabrications designed to mask an imperialist land grab. Under international law, the invasion is widely condemned as an illegal violation of state sovereignty, territorial integrity, and the post-World War II global order.