War in Donbas (2014–2022) in the context of "Luhansk People's Republic"

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.

The Russia–Ukraine border is the de jure international boundary between Russia and Ukraine. Over land, the border spans five Russian oblasts and five Ukrainian oblasts. Due to the ongoing Russo-Ukrainian War, which began in early 2014, the de facto border between Russia and Ukraine is different from the legal border recognized by the United Nations. As of 2024, Russia is militarily occupying a significant portion of Ukraine, and Ukraine is militarily occupying a very small portion of Russia.

According to a 2016 statement by Viktor Nazarenko, the head of the State Border Guard Service of Ukraine, the Ukrainian government did not have control over 409.3 kilometres (254.3 mi) of the international border with Russia. This stretch of land was formerly controlled by pro-Russian separatists under the Donetsk People's Republic and the Luhansk People's Republic (see War in Donbas), both of which were annexed by Russia in September 2022, seven months after the beginning of the ongoing Russian invasion of Ukraine. Ukraine has also not had authority over the Kerch Strait since 2014, when Russia annexed Crimea; the Ukrainian administration was pushed out of Crimea and Russian checkpoints were set up at the boundary with Kherson Oblast.

Russian separatist forces in Ukraine, primarily the People's Militias of the Donetsk People's Republic (DPR) and the Luhansk People's Republic (LPR), were pro-Russian paramilitaries in the Donbas region of eastern Ukraine. They were under the overall control of the Russian Federation. They were also referred to as Russian proxy forces. They were active during the war in Donbas (2014–2022), the first stage of the Russo-Ukrainian War. They then supported the Russian Armed Forces against the Ukrainian Armed Forces during the 2022 Russian invasion. In September 2022, Russia annexed the DPR and LPR, and began integrating the paramilitaries into its armed forces. They are designated as terrorist groups by the government of Ukraine.

The separatist paramilitaries were formed during the 2014 pro-Russian unrest in Ukraine. The Donbas People's Militia was formed in March 2014 by Pavel Gubarev, who proclaimed himself "People's Governor" of Donetsk Oblast, while the Army of the South-East was formed in Luhansk Oblast. The Donbas war began in April 2014 after these groups seized Ukrainian government buildings in the Donbas, leading the Ukrainian military to launch its Anti-Terrorist Operation against them.

The Ukrainian Ground Forces (SVZSU, Ukrainian: Сухопутні війська Збройних сил України, СВЗСУ, romanized: Sukhoputni viiska Zbroinykh syl Ukrainy), also referred to as the Ukrainian army, is a land force, and one of the eight branches of the Armed Forces of Ukraine. It was formed from Ukrainian units of the Soviet Army after Ukrainian independence, and its ancestry is traced back to the 1917–22 army of the Ukrainian People's Republic.

After the dissolution of the Soviet Union in 1991, Ukraine retained its Soviet-era army equipment. The Armed Forces were systematically downsized and underinvested in after 1991. As a result, the Ukrainian army had very little of its Soviet equipment in working order by July 2014, and most systems had become antiquated. Personnel numbers had shrunk and training, command, and support functions needed improvement. After the start of the war in Donbas in April 2014 in eastern Ukraine, Ukraine embarked on a program to enlarge and modernise its armed forces. Personnel in the Ukrainian Armed Forces overall climbed from 129,950 in March 2014 to 204,000 active personnel in May 2015, with 169,000 soldiers in the Ground Forces branch as of 2016. In 2016, 75% of the army consisted of contract servicemen. Since 2014, Ukraine's ground forces have also been equipped with increasingly modern tanks, APCs, and many other types of combat equipment.

The Territorial Defence Forces (abbr. TDF; Ukrainian: Війська територіальної оборони, romanized: Viiska terytorialnoi oborony, pronounced [wijsʲˈkɑ terɪtor⁽ʲ⁾iˈɑlʲnoji oboˈrɔnɪ], abbr. ВТО, VTO) are the military reserve component of the Armed Forces of Ukraine.

The Territorial Defence Forces were formed after the reorganization of the Territorial Defence Battalions, volunteer militias created during the war in Donbas under the command of the Ministry of Defence. Territorial Defence units existed from 2015 until 2021 in semi-organized forms until 2022 when they were officially organized into a unified corps that formed a separate branch of the Armed Forces of Ukraine.

The National Guard of Ukraine (NGU; Ukrainian: Національна гвардія України, romanized: Natsionalna hvardiia Ukrainy, IPA: [nɐts⁽ʲ⁾ioˈnɑlʲnɐ ˈɦwɑrd⁽ʲ⁾ijɐ ʊkrɐˈjinɪ]; abbr. НГУ/NHU [ˌɛnɦeˈu]) is the Ukrainian national gendarmerie and internal military force. It is part of the Ministry of Internal Affairs, responsible for public security. Originally created as an agency under the direct control of the Verkhovna Rada on 4 November 1991, following Ukrainian independence, it was later disbanded and merged into the Internal Troops of Ukraine in 2000 by President Leonid Kuchma as part of a "cost-saving" scheme. Following the 2014 Revolution of Dignity, amidst the Russian intervention, the National Guard was re-established, and the Internal Troops were disbanded.

The purpose of the National Guard is to serve as a military unit with law enforcement powers. Its mission is to ensure state security, protect state borders (supporting the State Border Service), participate in activities to neutralize paramilitary armed groups, terrorist organizations, organized groups and criminal organizations, protect critical infrastructure such as Ukraine's nuclear power plants, diplomatic missions, and buildings of the Ministry of Internal Affairs. The NGU has sent personnel to UN peacekeeping missions. During peacetime the National Guard focuses on civilian public security, combating organized crime and controlling civil unrest. During wartime the National Guard can be mobilized as a regular military force and take part in combat operations alongside the Armed Forces of Ukraine, which it has done during the war in Donbas and the 2022 Russian invasion of Ukraine.

Luhansk (UK: /luːˈhænsk/, US: /-ˈhɑːn-/; Ukrainian: Луганськ, IPA: [lʊˈɦɑnʲsʲk] ), also known as Lugansk (UK: /-ˈɡæn-/, US: /-ˈɡɑːn-/; Russian: Луганск, IPA: [lʊˈɡansk] ), is a city in the Donbas in eastern Ukraine. As of 2022, the population was estimated to be 397,677 (2022 estimate), making Luhansk the 12th-largest city in Ukraine.

Luhansk served as the administrative center of Luhansk Oblast, before pro-Russian separatists seized control of the city in 2014 and made it the capital of the self-proclaimed Luhansk People's Republic. The Ukrainian administration was located in Sievierodonetsk from 2014 to 2022 during the war in Donbas, due to Ukraine not being in control of Luhansk. Sievierodonetsk was captured by Russia in 2022 and Luhansk Oblast was later annexed by Russia in late 2022.

Alchevsk (Ukrainian: Алчевськ; Russian: Алчевск) is a city and the nominal administrative center of Alchevsk Raion in Luhansk Oblast, in the Donbas region of eastern Ukraine. It is located 45 kilometres (28 miles) from the administrative center of the oblast, Luhansk. Population: 106,062 (2022 estimate).

Alchevsk is one of the largest industrial centers in the Donbas, and comprises a quarter of the entire oblast's production. Its economy depends on the companies of OJSC "Alchevsk Iron & Steel Works" (a trade blockade by Ukrainian activists during the war in Donbas has all but halted production of this plant in February 2017) and "Alchevsk Coke-Chemical Plant".