bordered by Russia to the east and northeast; Belarus to the northwest; Poland, Hungary, and Slovakia to the west; Romania and Moldova to the southwest; and the Black Sea and Sea of Azov to the south and southeast, respectively.
By 4,500 BC, the Neolithic Cucuteni-Trypillian Culture flourished in a wide area that included parts of modern Ukraine including Trypillia and the entire Dnieper-Dniester region.
During the Iron Age, the land was inhabited by Cimmerians, Scythians, and Sarmatians.
The Golden Age of Kievan Rus' began with the reign of Vladimir the Great (980–1015), who turned Rus' toward Byzantine Christianity.
During the reign of his son, Yaroslav the Wise (1019–1054), Kievan Rus' reached the zenith of its cultural development and military power.
The state soon fragmented as the relative importance of regional powers rose again.
After a final resurgence under the rule of Vladimir II Monomakh (1113–1125) and his son Mstislav (1125–1132), Kievan Rus' finally disintegrated into separate principalities following Mstislav's death.Before its independence, Ukraine was typically referred to in English as "The Ukraine", but sources since then have moved to drop "the" from the name of Ukraine in all uses.Nonetheless it formed a limited military partnership with the Russian Federation and other CIS countries and a partnership with NATO in 1994.In 2013, after the government of President Yanukovych had decided to suspend the Ukraine-European Union Association Agreement and seek closer economic ties with Russia, a several-months-long wave of demonstrations and protests known as the Euromaidan began, which later escalated into the 2014 Ukrainian revolution that led to the overthrow of President Yanukovych and his cabinet and the establishment of a new government.These events formed the background for the annexation of Crimea by Russia in March 2014, and the War in Donbass in April 2014.A Cossack republic emerged and prospered during the 17th and 18th centuries, but its territory was eventually split between Poland and the Russian Empire, and later merged fully into Russia.