Russian invasion of Ukraine

On 24 February 2022, Russia invaded Ukraine in an escalation of the Russo-Ukrainian War that started in 2014. The invasion became the largest attack on a European country since World War II. It is estimated to have caused tens of thousands of Ukrainian civilian casualties and hundreds of thousands of military casualties. By June 2022, Russian troops occupied about 20% of Ukrainian territory. About 8 million Ukrainians had been internally displaced and more than 8.2 million had fled the country by April 2023, creating Europe's largest refugee crisis since World War II. Extensive environmental damage caused by the war, widely described as an ecocide, contributed to food crises worldwide.

Before the invasion, Russian troops massed near Ukraine's borders as Russian officials denied any plans to attack. Russian president Vladimir Putin announced a "special military operation" to support the Russian-backed breakaway republics of Donetsk and Luhansk, whose paramilitary forces had been fighting Ukraine in the Donbas conflict since 2014. Putin espoused irredentist views challenging Ukraine's right to exist, and falsely claimed that Ukraine was governed by neo-Nazis persecuting the Russian minority. He said his goal was to "demilitarize and denazify" Ukraine. Russian air strikes and a ground invasion were launched at a northern front from Belarus towards Kyiv, a southern front from Crimea, and an eastern front from the Donbas and towards Kharkiv. Ukraine enacted martial law, ordered a general mobilization and severed diplomatic relations with Russia.

Russian troops retreated from the northern front by April 2022 after encountering logistical challenges and stiff Ukrainian resistance. On the southern and southeastern fronts, Russia captured Kherson in March and Mariupol in May after a destructive siege. Russia launched a renewed offensive in the Donbas and continued to bomb military and civilian targets far from the front line, including the energy grid through the winter. In late 2022, Ukraine launched successful counteroffensives in the south and east. Soon after, Russia announced the illegal annexation of four partly occupied regions. In November, Ukraine retook parts of Kherson Oblast, including the city of Kherson itself. In June 2023, Ukraine launched another counteroffensive in the southeast.

The invasion was met with international condemnation. The United Nations General Assembly passed a resolution condemning the invasion and demanding a full Russian withdrawal in March 2022. The International Court of Justice ordered Russia to suspend military operations and the Council of Europe expelled Russia. Many countries imposed sanctions on Russia and its ally Belarus, and provided humanitarian and military aid to Ukraine. The Baltic states all declared Russia a terrorist state. Protests occurred around the world, along with mass arrests of anti-war protesters in Russia, which also enacted a law enabling greater media censorship. Over 1,000 companies closed their operations in Russia and Belarus as a result of the invasion. The International Criminal Court (ICC) opened investigations into possible crimes against humanity, war crimes, abduction of children, and genocide. The court issued an arrest warrant for Putin and Maria Lvova-Belova in March 2023, alleging responsibility for the unlawful deportation of children.