Is Russia's invasion of Ukraine justified?

The question of whether Russia's invasion of Ukraine is justified is a central and highly contentious issue in global politics. While the Russian government and its supporters present several arguments to justify the military action, the overwhelming consensus among international legal bodies, the United Nations, and most governments worldwide is that the invasion is an illegal act of aggression with no basis in international law.

Below is an overview of the primary arguments presented by both sides.

Arguments Presented by Russia (The Proposed Justifications)

The Russian government, led by President Vladimir Putin, has put forward several geopolitical, security, and historical arguments to justify what it terms a "special military operation":

Russia argues that the eastward expansion of the North Atlantic Treaty Organization (NATO) poses an existential threat to its national security. Moscow contends that the West broke verbal promises made at the end of the Cold War not to expand eastward. From Russia’s perspective, the prospect of Ukraine—a country sharing a vast border with Russia—joining NATO and potentially hosting Western military infrastructure is an unacceptable red line.

Russia claims its intervention was necessary to protect Russian-speaking populations in the eastern Donbas region of Ukraine. Moscow alleged that after the 2014 Euromaidan protests (which ousted Ukraine's pro-Russian President Viktor Yanukovych), the Ukrainian government engaged in systematic discrimination, persecution, and "genocide" against ethnic Russians and Russian-speakers in eastern Ukraine.

President Putin stated that the goals of the invasion were to "demilitarize" and "denazify" Ukraine. The Kremlin argues that Ukraine’s political and military institutions have been heavily influenced by far-right, ultra-nationalist, and neo-Nazi ideologies that are inherently hostile to Russia.

The Russian leadership has frequently emphasized the deep historical, cultural, and spiritual ties between Russians and Ukrainians, sometimes arguing that they are "one people." From this viewpoint, Ukraine's shift toward Western political, economic, and security alignment is seen as an artificial division of a historically unified space.

Arguments of the International Community and Ukraine (The Rejection of Justification)

The government of Ukraine, the United Nations General Assembly, international courts, and the vast majority of sovereign states reject Russia's justifications, characterizing the invasion as an unprovoked, illegal war of aggression. Their counterarguments include:

The invasion is widely recognized as a direct violation of Article 2(4) of the UN Charter, which prohibits UN member states from using or threatening force against the territorial integrity or political independence of any state. Ukraine is an independent, sovereign nation whose borders were internationally recognized—and explicitly guaranteed by Russia—under the 1991 Belavezha Accords and the 1994 Budapest Memorandum.

Under international law, sovereign states have the right to determine their own foreign policy, domestic governance, and security alliances. Proponents of this view argue that Ukraine has every right to seek membership in the European Union or NATO, and that Russia has no legal authority to veto the foreign policy decisions of a neighboring state.

Independent international observers, including the UN and the International Court of Justice (ICJ), have found no evidence to support Russia’s claims of "genocide" against Russian-speakers in Ukraine. Furthermore, while Ukraine (like many nations) has far-right political factions, they hold negligible power in the country's parliament. Critics also point out that Ukraine’s President, Volodymyr Zelenskyy, is Jewish and was democratically elected, undermining the "denazification" narrative.

Russia attempted to justify its actions under Article 51 of the UN Charter, which allows for individual or collective self-defense. However, legal experts note that Ukraine had not attacked or threatened to attack Russia. Russia’s recognition of the Donetsk and Luhansk separatist regions as "independent states" just prior to the invasion did not grant them status under international law, meaning Russia could not claim "collective self-defense" on their behalf.

Opponents emphasize the immense human suffering caused by the war, including tens of thousands of civilian casualties, the displacement of millions of refugees, and the widespread destruction of Ukrainian cities. The UN General Assembly has repeatedly voted by an overwhelming majority to condemn the invasion, demand the immediate withdrawal of Russian forces, and declare Russia's annexation of Ukrainian territories illegal.