Siege of Mariupol 2022: Azovstal, the Azov Regiment, and the Fall of the City

Overview and Significance

The Siege of Mariupol (February 24 – 20 May 2022) was the most significant single urban battle in European warfare since the Siege of Sarajevo or World War II. A major industrial port city of 440,000 people was besieged, bombarded for three months, and reduced to approximately 90% destroyed infrastructure, with civilian casualties estimated between 10,000 and 25,000 dead — many buried in mass graves or crushed beneath rubble.

Mariupol's fall was the most symbolically important Russian victory of the early war — completing the "land bridge" from Russia to Crimea and eliminating Ukraine's main Sea of Azov port. Yet the 86-day defense, particularly the final stand in the Azovstal steel plant, became a global symbol of Ukrainian resistance and delayed Russian forces that could otherwise have been redeployed to other fronts.

Strategic Importance of Mariupol

Mariupol occupied an extraordinarily important strategic position for multiple reasons:

• Land Bridge: The city's capture completed Russia's overland corridor from the Russian border through Donetsk and Zaporizhzhia to Crimea — eliminating the logistical dependence on the Crimean Bridge (Kerch Bridge) that Russia had built at great cost after the 2014 annexation
• Industrial Significance: The Azovstal Iron and Steel Works and Ilyich Iron and Steel Works were among Ukraine's largest industrial facilities, critical to Ukraine's metallurgical exports
• Port Access: As Ukraine's main Sea of Azov port, Mariupol was central to Ukrainian exports of steel, coal, and grain
• Symbolic Value: Mariupol had been partially controlled by Russian proxy forces (Donetsk People's Republic) from 2014 before being retaken by Ukrainian forces in 2015. Its recapture was both a practical goal and symbolic priority for Russia
• Military Assets: The city hosted significant Ukrainian military presence including the Azov Regiment, Naval Infantry (Marines), and National Guard units

The Encirclement (February–March 2022)

Russian forces advanced on Mariupol from two directions simultaneously from 24 February 2022: northeastward from Crimea and southwestward from the Donetsk People's Republic controlled areas. By approximately 2 March 2022 — just seven days into the invasion — Russian forces had effectively encircled Mariupol, cutting it off from Ukrainian-controlled territory.

The encirclement meant that no Ukrainian forces could reach Mariupol overland. Ukraine maintained limited helicopter supply operations in the early weeks, but Russian air defense eventually ended these. Ukraine's attempt to break through to Mariupol with armored forces was blocked by Russian defenses, leaving the defenders entirely isolated.

Ukrainian Forces at the Start

Ukrainian forces defending Mariupol at the start of the siege included:

• 36th Naval Infantry Brigade (36th Marine Brigade) — experienced regular military unit
• 12th National Guard Brigade ("Azov") — a National Guard unit with origins in the Azov volunteer battalion formed in 2014
• State Border Guard Service units
• Various territorial defense and police units
• Approximately 8,000–11,000 Ukrainian military and security personnel total at siege start

Humanitarian Catastrophe

The humanitarian situation in Mariupol deteriorated catastrophically within the first weeks. Russian forces surrounded and bombarded a city of 440,000 people while blocking humanitarian corridors — or routing them through Russian-controlled territory into Russia or Belarus rather than Ukrainian territory (a proposal Ukraine refused).

Loss of Utilities

Within days of the full encirclement, Mariupol lost:

• Electricity (power stations hit or disconnected)
• Heating (gas supply cut in freezing February temperatures)
• Running water (water infrastructure destroyed)
• Cellular communications (towers destroyed)
• Internet access

Residents melted snow for drinking water, burned furniture for heat, and cooked food over open fires in streets. Temperatures dropped to -5°C at night in the initial weeks.

Food and Medicine Crisis

Food stores were exhausted within weeks. Medicine — especially for the hundreds of wounded soldiers and thousands of injured civilians — ran critically short. Doctors performed surgeries without anesthesia as supplies ran out. The World Health Organization documented multiple strikes on hospitals and medical facilities in Mariupol.

Mass Graves

With no functioning burial infrastructure and ongoing bombardment making funeral services impossible, mass graves were dug throughout the city — in parks, on roadsides, even in residential courtyards. Satellite imagery captured these mass graves and served as critical evidence in war crimes documentation efforts by the International Criminal Court and Ukrainian prosecutors.

Mariupol Drama Theater Strike (16 March 2022)

On 16 March 2022, Russian aircraft bombed the Mariupol Drama Theater — a neoclassical building that had been designated as a civilian shelter and was housing approximately 1,000–1,200 civilians, mostly women, children, and elderly residents. Before the strike, the word "CHILDREN" (ДІТИ / ДЕТИ) had been written in large letters on the ground outside the building to signal to aircraft that it was a civilian shelter.

The attack killed an estimated 300–600 people, though the exact death toll remains uncertain due to the ongoing siege. It was the single deadliest incident in Mariupol and among the deadliest single strikes of the entire war. The United Nations, European Union, and Western governments condemned it as a war crime. Russia denied targeting the theater and falsely claimed "Azov nationalists" had blown it up from within.

The drama theater strike became one of the defining images of Russia's conduct in Ukraine — the deliberate targeting of a civilian structure clearly marked with "CHILDREN" — and was central to subsequent war crimes investigations.

Azovstal: The Last Stronghold

The Azovstal Iron and Steel Works was a massive Soviet-era industrial complex covering approximately 11 square kilometers on the eastern bank of Mariupol. Its most strategically important feature was not the above-ground industrial infrastructure (which was heavily damaged) but its underground network: deep bunkers and tunnels built during the Soviet era for civil defense purposes, extending up to 30 meters (nearly 100 feet) below ground.

These underground facilities proved virtually impervious to Russian bombardment. Russia deployed guided aerial bombs, including the massive FAB-500 and FAB-1500 bunker-busting ordnance, against the complex — reportedly without being able to penetrate to the deepest tunnels where defenders and civilians had sheltered.

Why Azovstal Was Defensible

The complex offered exceptional defensive characteristics beyond just the underground bunkers:

• Heavy industrial structural steel in aboveground buildings provided cover from small arms and some artillery
• The enormous footprint (11 km²) meant Russia would need to clear building by building
• Limited vehicular access points allowed defenders to channel attackers into kill zones
• Pre-2022 preparation: Ukrainian forces had reportedly stockpiled supplies in the facility

The Civilian Population Underground

In addition to military defenders, the Azovstal bunkers sheltered several hundred civilians — families of plant workers, residents who had sought shelter there in the early days of the siege. These civilians, including children, remained underground for weeks in extremely difficult conditions: limited food and water, no natural light, medical needs, and psychological trauma from the constant bombardment overhead.

The presence of civilians created a complex humanitarian situation that the UN and International Committee of the Red Cross (ICRC) eventually used as leverage to negotiate civilian evacuation corridors in May 2022.

The Defenders: Azov Regiment and Marines

The two primary defending forces in the Azovstal last stand were the Azov Regiment and the 36th Marine Brigade, though their journey to the final stronghold differed.

Azov Regiment

The Azov Regiment originated as a volunteer paramilitary formation organized in 2014 following Russia's initial aggression. It had controversial origins — some founders held ultranationalist views — but had been incorporated into Ukraine's National Guard and by 2022 had evolved into a professional military unit with training standards equivalent to Ukraine's best units. By the time of the full-scale invasion, Azov was one of Ukraine's most experienced urban warfare units and had deep familiarity with Mariupol, having been based there since 2014.

Russia used Azov's historical associations in propaganda about "Nazi Ukraine" despite the unit's integration into the regular military structure and Ukraine's democratic governance. This propaganda became a justification (though not the real cause) for Russia's prolonged siege tactics.

36th Marine Brigade

The 36th Naval Infantry Brigade suffered severe losses in the encirclement battles before consolidating in Azovstal. In early April, a large portion of the brigade attempted a breakout through the city, was cut off, and after brutal street fighting, many personnel were killed or captured while others managed to reach the Azovstal complex. Videos from captured marines became a significant propaganda moment for Russia.

Leadership

During the siege, multiple Ukrainian commanders became internationally known through their video messages from the underground bunkers. Colonel Denis Prokopenko (Azov commander), Major Serhiy Volyna (Marine commander), and other officers made direct international appeals to world leaders — including Pope Francis and Western heads of state — to establish evacuation corridors.

Civilian Evacuation from Azovstal (May 2022)

Beginning 1 May 2022, a series of UN and ICRC-brokered civilian evacuation operations removed civilians from the Azovstal bunkers over approximately five days. Around 500 civilians were evacuated in multiple groups, transported in UN-organized convoys via Russian-controlled territory to Zaporizhzhia. This was the only successful civilian corridor from Mariupol over the entire 86-day siege.

The evacuation operation required direct coordination between the UN Secretary-General António Guterres (who personally visited Kyiv and Moscow before the evacuations), the ICRC, and both Ukrainian and Russian military commands. It was described as a "miracle" by some participants given the hostile environment.

The final civilian group departed on approximately 7 May 2022. After that, only military personnel remained in the complex.

The Surrender (May 16–20, 2022)

With food, water, medicine, and ammunition running critically short and no prospect of evacuation or breakthrough, Ukrainian military command authorized the Azovstal defenders to surrender on 16 May 2022. Ukraine's government was careful to call this an "evacuation" rather than a surrender, framing it as the fulfillment of the fighters' mission (tying down Russian forces for 86 days) and a humanitarian extraction.

Between May 16 and 20 May 2022, approximately 2,439 Ukrainian military personnel exited Azovstal and entered Russian captivity. Russian state media broadcast the surrenders extensively. Among those surrendered were the Azov and Marine commanders.

Prisoner of War Treatment

The treatment of the Mariupol POWs was a persistent international concern. Russia classified some Azov members as "terrorists" or "Nazis" rather than POWs protected under the Geneva Conventions, creating legal uncertainty. In a landmark prisoner exchange in September 2022, Ukraine secured the release of a large group including senior Mariupol commanders — in exchange for pro-Russian Ukrainian politician Viktor Medvedchuk and 200 Russian POWs.

Occupation and Aftermath

After the siege, Russia rapidly moved to incorporate Mariupol into its occupation structure. The city was formally annexed as part of Zaporizhzhia Oblast during Russia's September 2022 annexation of four Ukrainian territories — though Mariupol is geographically in Donetsk Oblast, reflecting the administrative chaos of the occupation.

Physical Destruction

Estimates of destruction varied, but most analysts put 80–90% of the city's residential housing as damaged or destroyed, with many areas reduced to rubble. The pre-war population of 440,000 shrank to approximately 100,000–150,000 under occupation, with many former residents refusing to return under Russian control. Russia began reconstruction programs largely run by Russian companies, rebranding sections of the city in Russian style.

Azovstal Fate

The Azovstal complex was largely demolished by Russian authorities — the industrial equipment looted, the buildings demolished. Russia announced plans to build a tourism and recreation district on the site, erasing one of Ukraine's largest industrial facilities.

War Crimes Accountability

The International Criminal Court and Ukrainian Prosecutor General's Office compiled extensive evidence of war crimes committed during the Mariupol siege: targeted strikes on hospitals and the Drama Theater, use of cluster munitions in civilian areas, forced deportations of civilians to Russia, and mistreatment of POWs. The ICC issued arrest warrants related to Ukrainian children deported from occupied territories, with Mariupol among the specific examples cited.

Strategic Legacy

The 86-day siege had several strategic consequences rarely acknowledged in coverage of Russia's "victory":

• Russian forces assaulting Mariupol — estimated 20,000+ — were unavailable for operations elsewhere during the critical spring 2022 period
• The defense demonstrated that Ukrainian forces could impose massive costs on a besieging army even without air support or logistics resupply
• The dramatic imagery from Azovstal was a significant factor in accelerating Western military aid to Ukraine in spring 2022
• The defenders' resilience became a recruiting and morale symbol throughout the Ukrainian military

Frequently Asked Questions

How long was the Siege of Mariupol?

86 days, from February 24 to 20 May 2022.

What happened to the Azovstal defenders?

Approximately 2,439 Ukrainian military personnel surrendered and entered Russian captivity between May 16–20, 2022. Many were later exchanged in prisoner swap deals, including senior commanders released in a September 2022 exchange for Viktor Medvedchuk and 200 Russian POWs.

How many civilians died in Mariupol?

Estimates range from ~10,000 to over 25,000, with Ukrainian city authorities citing roughly 20,000–25,000. The true figure may never be confirmed due to mass graves, ongoing occupation, and destroyed records.

Was the Mariupol Drama Theater strike a war crime?

Multiple international bodies — including the UN, EU, and war crimes investigators — characterized the 16 March 2022 strike on the Drama Theater (marked with "CHILDREN") as a war crime. Russia denies deliberate targeting. ICC investigators have documented the incident as part of broader war crimes accountability work.

What is the current status of Mariupol?

As of 2025, Mariupol remains under Russian occupation. Russia has carried out reconstruction primarily through Russian companies, population has partially returned (~100,000–150,000 vs. 440,000 pre-war). The Azovstal complex has been largely demolished. International access for journalists or investigators remains blocked.