Background and Planning

Following the success of the Kharkiv and Kherson counteroffensives in autumn 2022, Ukraine and its Western partners began planning a major summer 2023 offensive. The campaign season planning started in late 2022, with Ukraine requesting specific weapon systems and training support to equip new brigades for Western-style combined arms warfare.

The "spring offensive" was repeatedly delayed into summer due to Western equipment deliveries arriving later than planned. Key systems — Leopard 2 tanks, Bradley IFVs, MRAP vehicles, self-propelled artillery — trickled in through spring 2023. Ukrainian crews trained in Germany, Poland, and the UK. Western advisors helped plan the operational concept.

The offensive was anticipated globally — media coverage of its preparation ran for months. This had an unintended consequence: Russia had months to observe the preparation and build its defenses.

Strategic Objectives

Ukraine's strategic objective was to cut Russia's land corridor to Crimea by driving from the Zaporizhzhia front southward. The operational sequencing aimed to:

1. Break through Russian defensive lines in Zaporizhzhia Oblast
2. Capture Tokmak (~40 km from the start line) — a logistics hub for Russian forces
3. Continue to Melitopol (~110 km from start) on the Sea of Azov coast
4. Reach the coast — cutting off Crimea by land and making the Russian position in Crimea and southern Ukraine untenable

Secondary axes included pressure at Bakhmut flanks (Klishchiivka, Andriivka) and other sectors to fix Russian reserves. The Zaporizhzhia axis was the main effort.

Forces Committed

Ukraine committed its best-equipped forces to the main effort:

• 47th Mechanized Brigade: Lead assault unit, equipped with US M2 Bradley IFVs and Leopard 2A6 tanks — NATO's most capable combined-arms package in Ukraine's arsenal
• Multiple additional mechanized and infantry brigades equipped with various combinations of Western and Soviet-era equipment
• Supporting artillery: HIMARS, M109 Paladin howitzers, Caesar SPH, PzH 2000, Polish Krab
• Air support: limited fixed-wing, Mi-24 attack helicopters, drones
• Engineer units with obstacle-clearing equipment

Total forces committed to the counteroffensive across all axes: approximately 40,000–60,000 troops in active assault roles.

Russia's Defensive Preparation

Russia had from October 2022 to June 2023 — approximately 8 months — to build the most extensive defensive lines seen in European warfare since World War II. Surovikin, appointed overall commander in October 2022 before being replaced by Gerasimov in January 2023, oversaw the defensive construction philosophy.

Russian defenses in the Zaporizhzhia sector consisted of three main defensive lines with a total depth of 20–30+ km:

• Forward positions: Observation posts, fighting positions, and outpost lines 5–10 km ahead of main defenses
• First main defensive line: Extensive trench networks, dragon's teeth anti-tank obstacles, minefields 1–2 km deep
• Second defensive line: Behind the first, similarly prepared, with additional fortifications at key terrain features
• Third/Surovikin line: Deep defensive positions with additional engineering that were visible on satellite imagery throughout the construction period

Western open-source analysts documented the construction in real time via commercial satellite imagery — and concluded the defenses were formidable. Whether Ukraine's planners fully incorporated the implications is debated.

The Minefield Problem

Ukraine encountered the densest minefields in modern warfare. Independent analysts estimated the Zaporizhzhia sector contained 1–3 anti-tank mines per meter of frontage in key approach corridors — exceeding even Korea War-era densities. Russia used a combination of:

• TM-62M anti-tank mines: Soviet-era blast mines, effective against armor
• POM-3 "Medallion" anti-personnel mines: Jump mines with seismic sensor triggers
• PTM-1S "Butterfly" scatterable mines: Deployed by artillery to rapidly mine approach routes
• Anti-tank guided mines: Future mines with magnetic influence fuzes
• Continuous mine resowing: Artillery-delivered mines to replenish gaps cleared by Ukrainians

The core problem was tactical: Western combined-arms doctrine requires engineer breach of minefields under covering fire before armor advances. Ukraine lacked sufficient dedicated mine-clearing vehicles (Wisent, M60 AVLB, mine rollers) in adequate numbers, and the covering fire required to protect engineers during clearing operations required air superiority Ukraine did not have.

June 4 Launch: The First Day

Ukraine launched the counteroffensive on 4 June 2023. The first day did not go as planned in the main effort sector.

Ukrainian mechanized columns advancing toward the first defensive line ran into the minefields at full force. The combination of mines, pre-sighted Russian artillery, and Russian Ka-52 attack helicopters operating at low altitude (below Ukrainian air defense coverage) struck Ukrainian armored formations as they attempted to cross the mine belts.

Multiple Leopard 2 tanks and Bradley IFVs were damaged or destroyed on the first day. Some vehicles drove off the mine-cleared lanes in the chaos of combat. Others were struck by RPG or drone while stationary in the minefield waiting for engineers to clear the path ahead. Dramatic satellite imagery showed clusters of Ukrainian armor damaged in fields that should have been approach routes.

Initial Leopard and Bradley Losses

The first week of the counteroffensive produced Ukrainian losses that shocked Western observers:

• Multiple Leopard 2A6 tanks lost — one of NATO's most capable MBTs, encountered for the first time in combat against Russian defenses
• Multiple M2 Bradley IFVs lost or damaged
• Significant numbers of mine-protected vehicles damaged
• Russian state media broadcast footage of damaged equipment in fields — providing high-value propaganda

Oryx confirmed losses of at least 12 Leopard 2 tanks and 20+ Bradley IFVs in the first weeks of combat. The losses were not catastrophic in absolute terms — Ukraine's total Western armor pool was 100+ vehicles in total — but they demonstrated the mismatch between the training received and the actual conditions.

The Tactical Reset

After the first week's experience, Ukraine's military leadership ordered a tactical reset. Key changes:

• Return to infantry-first tactics: Rather than leading with armored columns that attracted drone and helicopter attention, Ukraine shifted to slower, infantry-led tactics — probe, suppress, clear, advance
• Reduced armor exposure: Tanks moved to supporting fires role rather than leading assaults
• Improved mine clearance: Greater emphasis on manual demining and night operations to reduce ISR visibility
• Drone coordination: Better integration of Ukrainian tactical drones to suppress Russian ATGMs and drone operators before advancing

The reset slowed the advance rate significantly but reduced losses to more sustainable levels. Ukraine shifted from seeking rapid breakthrough to methodical grinding against Russian defenses.

Robotyne and Verbove

Ukraine's most significant tactical achievements in the 2023 counteroffensive were the capture of Robotyne (23 August 2023) and subsequent advances toward Verbove. Robotyne was a small village but symbolically significant — the first settlement captured in the Zaporizhzhia axis after weeks of fighting.

By September–October 2023, Ukrainian forces had penetrated the first Russian defensive line in the Robotyne sector and were engaging positions in and around the second line. The maximum advance in this area reached approximately 14–17 km from the June start line.

Tokmak — the operational objective that was supposed to grant access to the second defensive line's rear — remained approximately 15 km away. Ukrainian forces never reached it.

Russian Air Power: The Missing Factor

A critical factor restricting Ukrainian operations was Russian air power — specifically the KAB glide bomb campaign. Russia's Su-34 and Su-35 aircraft, operating from distances beyond most Ukrainian air defense reach, began dropping modified large bombs fitted with glide kits (UMPK — Unified Glide Module and Correction) at high altitude and at standoff distance.

These glide bombs — 500, 1,500, and 3,000 kg variants — could be dropped from 30–50 km standoff, beyond MANPADS range, and glided to targets. Without long-range air defense systems capable of engaging aircraft at 50+ km, Ukraine could not suppress the aircraft releasing the bombs.

Russian glide bomb campaign effects:

• Attacked Ukrainian assembly areas and supply routes
• Struck Ukrainian fortified positions ahead of infantry attacks
• Imposed psychological and operational costs on Ukrainian concentrations
• Approximately 3,000+ glide bombs dropped in the June–December 2023 period, scaling to 100+ per day by 2024

Ukraine's requested long-range air defense systems (Patriot PAC-3 in particular) were insufficient in number to provide wide coverage, and Western governments were slow to approve systems that could help suppress Russian air operations.

Offensive Culmination

By November 2023, the 2023 counteroffensive had culminated. Ukraine's forces were exhausted, ammunition consumption had far exceeded replenishment rates, and the winter ground conditions made further advances impractical. Ukraine shifted to defensive consolidation around the gains made — primarily in the Robotyne-Verbove area.

The overall assessment: Ukraine captured a strip of territory approximately 14–17 km deep and 20–25 km wide in the Zaporizhzhia sector — tactically meaningful but strategically far below the objective of reaching Melitopol or cutting the land bridge. The war entered a grinding attritional phase through winter 2023–2024.

Strategic Lessons

The 2023 counteroffensive generated extensive post-operational analysis. Key lessons:

1. Air supremacy precondition: Western combined-arms doctrine assumes air superiority or at least air parity; Ukraine had neither. The offensive was planned without addressing the aircraft-delivered glide bomb problem
2. Mine density underestimated: Intelligence may have accurately described minefield density, but the operational planning did not adequately account for the engineering requirement to breach fields under fire in contested airspace
3. Artillery ammunition math: The offensive consumed vastly more artillery ammunition than Ukraine's Western resupply could provide; the EU's promised 1 million shells by March 2024 arrived late and short
4. Doctrine transfer incomplete: Ukrainian brigades received ~10 weeks of NATO training but needed 12+ months for full capability development; tactics trained in Germany did not reflect actual enemy defenses encountered
5. Reserve commitment timing: Ukraine held significant reserves that were not committed at decisive moments — possibly to preserve against Russian counteroffensives; this added operational caution that reduced exploitation opportunities

The lessons reshaped Ukrainian strategy for 2024: greater emphasis on decapitation strikes deep into Russian logistics, drone warfare, fortification of Ukrainian defensive lines, and away from large-scale conventional offensive operations that Russia's prepared defenses could absorb.

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