Avdiivka: Nine Years of Ukrainian Fortification

Avdiivka, an industrial city of approximately 35,000 pre-war residents, sat at the northern edge of Russian-occupied Donetsk city's suburbs. Following the beginning of the Donbas conflict in 2014, Ukrainian forces established a defensive line through Avdiivka that remained essentially static for eight years — a relative stability unusual in the region's history. During those eight years, Ukrainian forces and military engineers transformed Avdiivka into one of the most heavily fortified positions on the front: concrete bunkers, interconnected trench networks, observation posts in multi-story industrial structures, and pre-registered artillery fires covering all approaches. The Avdiivka Coke and Chemical Plant — a massive Soviet-era industrial facility with underground levels, blast-resistant construction, and a physical footprint roughly 2 km × 1 km — served as the anchor of the defense, providing shelter for hundreds of defenders against air strikes and artillery.

The city's tactical value extended beyond its fortifications: Avdiivka's elevated positions could range artillery into the northern suburbs of Russian-occupied Donetsk city, making it politically intolerable to Russian-backed authorities in the "Donetsk People's Republic" who had sought its capture since 2014. For nine years, periodic Russian assaults (most notably the bloody 2017 escalation) failed to dislodge Ukrainian defenders. After the full-scale invasion began in February 2022, the established Avdiivka defensive line held — Russia's initial invasion priorities were elsewhere — and the city remained Ukrainian until the prolonged 2023–2024 assault.

Russian Assault: October 2023

Russia launched a major offensive operation against Avdiivka beginning in early October 2023, shortly after the Ukrainian counteroffensive in Zaporizhzhia had decelerated and Russian commanders assessed opportunity to apply pressure in Donetsk. The attack was conducted primarily by elements of the 1st Guards Tank Army's subordinate units, the 41st Combined Arms Army, and assault units of the Russian Ground Forces — using the combination of massive artillery preparation, glide bomb (FAB-500/1500 series) strikes on Ukrainian positions, and mechanized infantry assault that had characterized Russian offensive operations throughout 2023. The attack aimed to envelop Avdiivka from the north and south, cutting the city off from its Donetsk Oblast hinterland to the west.

The initial Russian assault columns suffered extremely heavy losses in the October–November 2023 period, with Ukrainian forces using the nine years of fortification investment to maximum effect: pre-registered artillery fires destroyed Russian armored vehicles; FPV drones picked off command vehicles and logistics; and the defenders' familiarity with every meter of the urban terrain allowed tactical flexibility Russian commanders could not match. Oryx documented dozens of Russian armored vehicle losses in the Avdiivka sector in October–November 2023 alone — representing billions of rubles of equipment destroyed for minimal initial territorial gain.

The Avdiivka Coke Plant Fortress

The Avdiivka Coke and Chemical Plant (known by the Ukrainian abbreviation АКХЗ) became the physical and symbolic anchor of Ukrainian defense — described in media coverage as "Avdiivka's Azovstal," referencing the Mariupol steel plant where Ukrainian defenders held out for 86 days in 2022. The plant's industrial infrastructure — blast furnaces, chemical processing towers, overhead crane structures, underground service tunnels and bunkers — provided protection and tactical positions that centuries of urban fortification experience would recognize as ideal defensive ground. Tunnels allowed Ukrainian troops to move unseen between fighting positions even under intense Russian artillery bombardment. Elevated industrial structures provided observation posts overlooking Russian assembly areas. Concrete foundations and walls designed to withstand industrial accidents provided significant protection against direct artillery hits.

Ukrainian defenders used the plant's complexity to offset Russia's numerical advantage: Russian assault teams entering the plant complex found themselves in an environment where small Ukrainian teams with intimate terrain knowledge could hold approaches against larger formations. The plant's size — approximately 2,000 × 1,000 meters — meant that even as Russia advanced around the city's perimeter, defenders in the plant retained defensible positions and supply access through the western corridor. The plant's final significance was as the last major holdout position when other districts fell to Russian encirclement in February 2024.

Four Months of Urban Combat

The battle for Avdiivka's residential and commercial districts (outside the plant complex) followed the pattern established at Bakhmut and earlier urban battles in Ukraine: house-by-house fighting in which advantage shifted from attacker to defender as structures changed hands; Russian forces using superior artillery mass to reduce buildings to rubble before assault; Ukrainian defenders using rubble as additional defensive material; both sides employing FPV drones in unprecedented density for urban surveillance and targeted strikes on infantry in exposed positions. November–December 2023 saw Russian forces advance into the northern and southern flanks of the city, gaining terrain in less fortified residential districts while failing repeatedly against the main Ukrainian positions around the plant.

January–February 2024 brought increasing Russian pressure with simultaneous advances along multiple axes, exploiting Ukraine's thinning reserves and ammunition constraints. Russian forces reached the rail depot north of the city and the Tsarskaya Okhota restaurant landmark south of the city — points that, when connected, would represent full encirclement. Ukrainian troops in isolated eastern districts faced increasingly difficult resupply, with vehicles using the M04 highway under Russian artillery fire as the primary supply route. The physical geography of the Avdiivka salient — a protrusion into Russian-held territory with flanks exposed — became increasingly untenable as Russian forces advanced on both flanks.

Ammunition Shortage: The Critical Factor

The battlefield trajectory of the Avdiivka battle was fundamentally shaped by Ukraine's ammunition crisis — directly attributable to the US Congressional blockage of the $61 billion supplemental aid package from October 2023 to April 2024. Ukrainian artillery batteries defending Avdiivka, which in earlier battle phases had fired thousands of 155mm shells daily to suppress Russian assault columns, were by late 2023 rationed to hundreds of rounds per day — insufficient to maintain the suppressive fire required to prevent Russian infantry from advancing in the post-artillery landscape. Ukrainian battalion commanders gave public interviews stating their units had received as few as 5–10 artillery shell allocations per day for entire sectors — a level where artillery's primary value (mass suppressive fire) is essentially eliminated.

The ammunition shortage created a compounding tactical problem: with insufficient artillery to destroy Russian assault formations in the open, Russian infantry reached close-quarters urban positions where artillery use risked Ukrainian casualties; once in close urban combat, the numerical advantage of Russia's assault forces (deploying replaceable "storm squads" of contract soldiers and mobilized personnel) became more decisive; and the need to prioritize ammunition for the most critical sectors left other sectors more vulnerable, enabling Russian flanking advances. Soldiers' accounts from Avdiivka described knowing Russian assault groups were forming in designated areas but lacking the artillery rounds to destroy them before the assault commenced — a direct inversion of the conditions under which Ukraine had successfully defended in 2022–early 2023.

Encirclement Threat and Supply Corridor

The decisive operational development of early February 2024 was Russia's advance to positions threatening to close the western supply corridor into Avdiivka. The M04 highway and the road network west of the city were the lifelines for ammunition, resupply, and casualty evacuation. Russian advances south of the corridor had brought Russian observation posts and then fire positions to locations from which the last supply route could be engaged with direct fire. Ukrainian vehicles using the corridor came under increasingly intense fire; a number were destroyed on the route; and the psychological and logistical pressure on the garrison increased toward a critical threshold.

Ukrainian military assessments in early February 2024 identified the risk of complete encirclement — a "cauldron" in military terminology — as not merely theoretical but imminent. The experience of Bakhmut (where the encirclement was prevented only by the narrowest margin and at significant cost) and of Mariupol (where encirclement led to siege and eventual capture) was explicitly referenced by Ukrainian commanders in their public communications during this period. The choice between defending in an encirclement (potentially trading the entire garrison for prolonged delay) or withdrawing while the corridor remained passable was made in favor of withdrawal — saving the experienced defenders for future operations rather than sacrificing them to a fixed position whose military significance was diminishing as encirclement approached.

Ukrainian Withdrawal: 17 February 2024

Commander-in-Chief General Valerii Zaluzhnyi authorized the Avdiivka withdrawal order — one of his final significant operational decisions before President Zelensky replaced him with General Oleksandr Syrskyi on 8 February 2024 (the withdrawal itself executed under Syrskyi's first days in command). The withdrawal on 17 February 2024 was conducted under fire, with Ukrainian forces moving west through the narrowing corridor while rear-guard elements maintained defensive positions to enable evacuation. Not all Ukrainian troops were able to withdraw successfully before Russian forces closed the corridor — some were killed, captured, or isolated; exact figures were operationally sensitive and remain partially unclear. Ukrainian commanders described the operation as a controlled withdrawal that preserved the core of the defending force, though individual accounts from soldiers described chaotic conditions under Russian fire in the final hours.

President Zelensky acknowledged the withdrawal publicly on February 17, stating: "The decision was made to withdraw from Avdiivka to avoid encirclement and preserve the lives of our soldiers." He described Russian losses in the battle as enormous — a claim supported by battlefield evidence — and framed the withdrawal as a tactical decision consistent with overall strategic objectives. The political sensitivity of the fall was compounded by Avdiivka's nine-year history as a Ukrainian-held symbol of resistance in the Donbas.

Russian Losses in the Assault

Russia's capture of Avdiivka came at exceptional cost. Oryx documented hundreds of visually confirmed Russian equipment losses in the Avdiivka sector over the four-month assault — including tanks, IFVs, APCs, artillery systems, MLRS, and other vehicles. Ukrainian official estimates placed Russian personnel casualties (KIA + WIA) in the Avdiivka battle at 20,000–30,000+ — a figure difficult to verify independently but consistent with the scale and intensity of combat over four months. Russian assault tactics (repeated waves of storm troopers against prepared defensive positions) produce high attacker-to-defender casualty ratios; the Avdiivka battle, like Bakhmut, appears to have demonstrated this dynamic at scale. The Russian military's willingness to sustain these losses to capture an industrial city of limited post-battle economic value reflects a command culture prioritizing symbolic and political achievements over cost-benefit military calculus.

Strategic Significance

The fall of Avdiivka had multiple strategic dimensions: militarily, it opened the western approaches toward Pokrovsk and further into Donetsk Oblast from a new direction, expanding the Russian front axis of advance; politically, it was a significant propaganda victory for Russia — framed as liberation of a Russian-populated city threatening Donetsk — and demonstrated that Russia could sustain offensive momentum even at high cost; for Ukraine, it was a sobering demonstration of what ammunition shortages could cost in terms of territorial defense; and for Western debate, the Avdiivka withdrawal was cited by US officials and Congress members as direct evidence of the consequences of delays in the supplemental aid package. The April 2024 American supplemental authorization of $61 billion was partly politically propelled by the Avdiivka loss and the visible connection between ammunition shortage and territorial defeat.