Kharkiv Oblast in the context of "Luhansk Oblast"

The Russian-occupied territories of Ukraine are areas of southern and eastern Ukraine that are controlled by Russia as a result of the Russo-Ukrainian War and the ongoing invasion. In Ukrainian law, they are defined as the "temporarily occupied territories". As of 2024, Russia occupies almost 20% of Ukraine and about 3 to 3.5 million Ukrainians are estimated to be living under occupation; since the invasion, the occupied territories lost roughly half of their population. The United Nations Human Rights Office reports that Russia is committing severe human rights violations in occupied Ukraine, including arbitrary detentions, enforced disappearances, torture, crackdown on peaceful protest and freedom of speech, enforced Russification, passportization, indoctrination of children, and suppression of Ukrainian language and culture.

The occupation began in 2014 with Russia's invasion and annexation of Crimea, and its de facto takeover of Ukraine's Donbas during a war in eastern Ukraine. In 2022, Russia launched a full-scale invasion. However, due to fierce Ukrainian resistance and logistical challenges (e.g. the stalled Russian Kyiv convoy), the Russian Armed Forces retreated from northern Ukraine in early April. In September 2022, Ukrainian forces launched the Kharkiv counteroffensive and liberated most of that oblast. Another southern counteroffensive resulted in the liberation of Kherson that November.

Kharkiv is the second-largest city in Ukraine. Located in the northeast of the country, it is the largest city of the historic region of Sloboda Ukraine. Kharkiv is the administrative center of Kharkiv Oblast and Kharkiv Raion. Prior to the Russian invasion of Ukraine in early 2022, it had an estimated population of 1,421,125.

Founded in 1654 as a Cossack fortress, by late 19th century Kharkiv had developed within the Russian Empire as a major commercial and industrial center. From December 1919 to January 1934, Kharkiv was the capital of the Ukrainian Soviet Socialist Republic. During this period migration from the distressed countryside and a relaxation of restrictions on Ukrainian cultural expression changed the city's ethnic complexion: Ukrainian replaced Russian as the largest recorded nationality. It was the sixth largest city in the Soviet Union during its existence.

On 6 September 2022, the Armed Forces of Ukraine launched a major counteroffensive against the Russian military during the Russo-Ukrainian war. As Ukraine announced the start of the Kherson counteroffensive in southern Ukraine in late August, Ukrainian forces also began a second counteroffensive in early September in Kharkiv Oblast, in eastern Ukraine.

As the Ukrainian military broke through Russian defensive lines, it recaptured multiple cities in a matter of days. On 7 September, the second day of the counteroffensive, the Ukrainian military advanced over 20 kilometres (12 mi) into Russian-held territory. The next day, Ukraine recaptured Balakliia and Shevchenkove as Russian forces withdrew and fled. On the 9th, Russia began announcing for evacuations in nearby areas as the Ukrainian military continued its advance. The next day, Ukraine retook the key cities of Izium and Kupiansk, securing access to the Oskil River. By the 11th, Ukraine successfully advanced up to 70 kilometres (43 mi) from the pre-counteroffensive front line. In turn, Russia's defence ministry announced the withdrawal of all forces west of the Oskil.

Eastern Ukraine or East Ukraine (Ukrainian: Східна Україна, romanized: Skhidna Ukrayina; Russian: Восточная Украина, romanized: Vostochnaya Ukraina) is primarily the territory of Ukraine east of the Dnipro (or Dnieper) river, particularly Kharkiv, Luhansk and Donetsk oblasts (provinces). Dnipropetrovsk and Zaporizhzhia oblasts are often also regarded as "eastern Ukraine".

Almost a third of the country's population lives in the region, which includes several cities with population of around a million. Within Ukraine, the region is the most highly urbanized, particularly portions of central Kharkiv Oblast, south-western Luhansk Oblast, central, northern and eastern areas of Donetsk Oblast.

Kharkiv Raion (Ukrainian: Харківський район) is a raion (district) of Kharkiv Oblast in eastern Ukraine. Its administrative center is the city of Kharkiv. Population: 1,729,049 (2022 estimate).

On 18 July 2020, as part of the administrative reform of Ukraine, the number of raions of Kharkiv Oblast was reduced to seven, and the area of Kharkiv Raion was significantly expanded. One abolished raion, Derhachi Raion, as well as Liubotyn Municipality, part of Nova Vodolaha Raion, and the city of Kharkiv, which was previously incorporated as a city of oblast significance and did not belong to the raion, were merged into Kharkiv Raion. The January 2020 estimate of the population of the former Kharkiv Raion was 176,186 (2020 est.).

Sumy Oblast (Ukrainian: Сумська область, romanized: Sumska oblast), also known as Sumshchyna (Сумщина), is an oblast (province) in northeast Ukraine. The oblast was created in its modern-day form, from the merging of raions from Kharkiv Oblast, Chernihiv Oblast, and Poltava Oblast in 1939 by the Presidium of the Supreme Soviet of the Soviet Union. The estimated population is 1,035,772 (2022 estimate).

The administrative center of the oblast is the city of Sumy. Other important cities within the oblast include Konotop, Okhtyrka, Romny, and Shostka. The modern region combines territories of the historical Severia (northern part) and Sloboda Ukraine (southern part). On territory of the Sumy Oblast important centers of Ukrainian culture are located, such as the city of Hlukhiv which served as a hetman residence during the Cossack Hetmanate as well as the cities of Okhtyrka and Sumy which were regional centers of the Sloboda Ukraine.

The Seversky Donets (Russian: Се́верский Доне́ц) or Siverskyi Donets (Ukrainian: Сіверський Донець), usually simply called the Donets (Russian: Донец, lit. 'Don + - ets, suffix'), is a river on the south of the East European Plain. It originates in the Central Russian Upland, north of Belgorod, flows south-east through Ukraine (Kharkiv, Donetsk and Luhansk Oblasts) and then again through Russia (Rostov Oblast) to join the river Don, about 100 km (62 mi) from the Sea of Azov. The Donets is the fourth-longest river in Ukraine, and the largest in eastern Ukraine, where it is an important source of fresh water. It gives its name to the Donets Basin, known commonly as the Donbas, an important coal-mining and industrial region in Ukraine.

From the end of February 2014, in the aftermath of the Euromaidan and the Revolution of Dignity, which resulted in the ousting of Russian-leaning Ukrainian president Viktor Yanukovych, demonstrations by Russian-backed, pro-Russian, and anti-government groups (as well as pro-government demonstrations) took place in Crimea, Donetsk, Luhansk, Kharkiv and Odesa. The unrest, which was supported by the Russian military and intelligence services, belongs to the early stages of the Russo-Ukrainian war.

During its first phase in February–March 2014, the Ukrainian territory of Crimea was invaded and subsequently annexed by Russia following an internationally unrecognized referendum, with the United Nations General Assembly voting in favor of Ukraine's territorial integrity. Concurrently, protests by anti-Maidan and pro-Russian groups took place across other parts of eastern and southern Ukraine. Local separatists, some directed and financed by the Russian security services, took advantage of the situation and occupied government buildings in Donetsk, Luhansk, and Kharkiv oblasts in early March 2014. The Ukrainian government was able to quickly quell this unrest, and removed the separatists by 10 March.

Ukraine's easternmost regions, Donetsk, Luhansk, and Kharkiv, have been the site of an ongoing theatre of operation since the start of the Russian invasion of Ukraine in February 2022.

The battle of Donbas was a major offensive in the eastern theatre that took place in mid-2022. By the culmination of the offensive in July 2022, Russian forces and their separatist allies had captured the cities of Sievierodonetsk, Lysychansk, Rubizhne and Izium. However, in early September, Ukraine launched a major counteroffensive in the east, which recaptured the cities of Izium, Balakliia, Kupiansk, Sviatohirsk and the strategic city of Lyman. The counteroffensive stalled east of the Oskil river, and a campaign in eastern Kharkiv Oblast and western Luhansk Oblast has continued since, though Donetsk Oblast has remained the most active area of the frontline.