A part of Scythia in antiquity, Ukraine was largely settled by Greuthungi, Getae, Goths, and Huns in the Migration Period, while southern parts of Ukraine were previously colonized by Greeks and then Romans. In the Early Middle Ages it was also a site of early Slavic expansion. The hinterland entered into written history with the establishment of the medieval state of Kievan Rus', which emerged as a powerful nation but disintegrated during the High Middle Ages, and was destroyed by the Mongol Empire in the 13th century.
During the 14th and 15th centuries, present-day Ukrainian territories came under the rule of four external powers: the Golden Horde, the Crimean Khanate, the Grand Duchy of Lithuania and the Crown of the Kingdom of Poland. The latter two would then merge into the Polish–Lithuanian Commonwealth following the Union of Krewo and Union of Lublin. Meanwhile, the Ottoman Empire emerged as a major regional power in and around the Black Sea, through protectorates such as the Crimean Khanate, as well as directly-administered territory.
After a 1648 rebellion of the Cossacks against the Polish–Lithuanian Commonwealth, Hetman Bohdan Khmelnytsky agreed to the Treaty of Pereyaslav in January 1654. The exact nature of the relationship established by this treaty between the Cossack Hetmanate and Russia remains a matter of scholarly controversy. The agreement precipitated the Russo-Polish War of 1654–67 and the failed Treaty of Hadiach, which would have formed a Polish–Lithuanian–Ruthenian Commonwealth. In consequence, by the Treaty of Perpetual Peace, signed in 1686, the eastern portion of Ukraine (east of the Dnieper River) was to come under Russian rule.
During the Great Northern War, Hetman Ivan Mazepa allied with Charles XII of Sweden in 1708. However, the Great Frost of 1709 greatly weakened the Swedish army. Following the Battle of Poltava later in 1709, there was a diminishment in Hetmanate power, culminating with the disestablishment of the Cossack Hetmanate in the 1760s and the destruction of the Zaporozhian Sich in the 1770s. Following the Partitions of Poland (1772–1795) and the Russian conquest of the Crimean Khanate, the Russian Empire and Habsburg Austria were in control of all the territories that constitute present-day Ukraine for over a hundred years. Ukrainian nationalism developed in the 19th century.
A chaotic period of warfare ensued after the Russian Revolutions of 1917, as well as a simultaneous war in the former Kingdom of Galicia and Lodomeria following the dissolution of the Habsburg monarchy after World War I. The Soviet–Ukrainian War (1917–1921) followed, in which the Bolshevik Red Army established control in late 1919. The Ukrainian Bolsheviks, who had defeated the national government in Kiev, established the Ukrainian Soviet Socialist Republic, which on 30 December 1922 became one of the founding republics of the Soviet Union. Initial Soviet policy on the Ukrainian language and Ukrainian culture made Ukrainian the official language of administration and schools. Policy in the 1930s turned to Russification. In 1932 and 1933, millions of people in Ukraine, mostly peasants, starved to death in a devastating famine, known as the Holodomor. It is estimated that 6 to 8 million people died from hunger in the Soviet Union during this period, of whom 4 to 5 million were Ukrainians.
After the Soviet Union and Nazi Germany invaded Poland in September 1939, the Ukrainian SSR's territory expanded westward. Axis armies occupied Ukraine from 1941 to 1944. During World War II, elements of the Ukrainian Insurgent Army fought for Ukrainian independence against both Germany and the Soviet Union, while other elements collaborated with the Nazis, assisting them in carrying out the Holocaust in Ukraine and their oppression of Poles. In 1953, Nikita Khrushchev, ethnic Russian former head of the Communist Party of Ukraine, succeeded as head of the Communist Party of the Soviet Union and enabled more political and cultural freedom, which led to a Ukrainian revival. In 1954 the republic expanded to the south with the transfer of Crimea from Russia. Nevertheless, political repressions against poets, historians and other intellectuals continued, as in all other parts of the USSR.
Ukraine became independent when the Soviet Union dissolved in 1991. This started a period of transition to a market economy, in which Ukraine suffered an eight-year recession. Subsequently however, the economy experienced a high increase in GDP growth until it plunged during the Great Recession.
A prolonged political crisis began on 21 November 2013, when president Viktor Yanukovych suspended preparations for the implementation of an association agreement with the European Union, instead choosing to seek closer ties with Russia. This decision resulted in the Euromaidan protests and later, the Revolution of Dignity. Yanukovych was then impeached by the Ukrainian parliament in February 2014. On 20 February, the Russo-Ukrainian War began when Russian forces entered Crimea. Soon after, pro-Russian unrest enveloped the largely Russophone eastern and southern regions of Ukraine, from where Yanukovych had drawn most of his support. An internationally unrecognized referendum in the largely ethnic Russian Ukrainian autonomous region of Crimea was held and Crimea was de facto annexed by Russia on 18 March 2014. The War in Donbas began in Donetsk and Luhansk oblasts of Ukraine involving the Russian military. The war continued until 24 February 2022, when Russia launched a major invasion of much of the country.
