The Act of Declaration of Independence of Ukraine (Ukrainian: , romanized: Akt proholoshennya nezalezhnosti Ukrayiny) was adopted by the Supreme Soviet of the Ukrainian SSR on 24 August 1991. The Act reestablished Ukraine's state independence.

Ukraine (Ukrainian: Україна, romanized: Ukraïna, pronounced [ʊkrɐˈjinɐ] (listen)) is a country in Eastern Europe. It is the second largest country in Europe after Russia, which it borders to the east and north-east. Ukraine also shares borders with Belarus to the north; Poland, Slovakia, and Hungary to the west; Romania and Moldova to the south; and has a coastline along the Sea of Azov and the Black Sea. It spans an area of 603,628 km2 (233,062 sq mi), with a population of about 40 million. The nation's capital and largest city is Kyiv.

The territory of modern Ukraine has been inhabited since 32,000 BC. During the Middle Ages, the area was a key centre of East Slavic culture under Kievan Rus', which was ultimately destroyed by the Mongol invasion in the 13th century. Over the next 600 years, the area was contested, divided, and ruled by external powers, including the Polish–Lithuanian Commonwealth, the Austrian Empire, Austria-Hungary, the Ottoman Empire, and the Tsardom of Russia. The Cossack Hetmanate emerged in Central Ukraine in the 17th century but was partitioned between Russia and Poland, and ultimately absorbed by the Russian Empire entirely. In the aftermath of the Russian Revolution, a Ukrainian national movement re-surfaced and the Ukrainian People's Republic was formed in 1917. The short-lived state was forcibly reconstituted into the Ukrainian Soviet Socialist Republic, which became a founding member of the Soviet Union (USSR) in 1922. From 1932 to 1933 the Holodomor killed millions of Ukrainians. In 1939, Western Ukraine was annexed from Poland by the USSR. Ukraine was the most populous and industrialised republic after the Russian Soviet Republic, until regaining its independence in 1991 following the dissolution of the Soviet Union.

Following its independence, Ukraine has been governed as a unitary republic under a semi-presidential system. It declared itself a neutral state, forming a limited military partnership with Russia and other CIS countries while also establishing a partnership with NATO in 1994. In 2013, after President Viktor Yanukovych suspended the Ukraine–European Union Association Agreement in favor of closer economic ties with Russia, mass protests and demonstrations known as the Euromaidan erupted, escalating into the Revolution of Dignity that led to the overthrow of Yanukovych and the establishment of a new government. These events formed the background to Russia's annexation of Crimea in March 2014 and the War in Donbas the following month. The latter was a protracted conflict with Russian-backed separatists that culminated in a Russian invasion in February 2022. Ukraine has continued seeking closer economic, political, and military ties with the West amid continuing war with Russia.Ukraine is a developing country with a lower-middle income economy, ranking 74th in the Human Development Index. Ukraine is among the poorest countries in Europe. As of 2020 it suffers from low life expectancy and widespread corruption. However, due to its extensive fertile land, Ukraine is one of the largest grain exporters in the world. It is a member of the United Nations, the Council of Europe, the OSCE, the GUAM organization, the Association Trio, and the Lublin Triangle.