BRUSSELS / KYIV — March 16, 2026 : Belgian defense manufacturer John Cockerill Defense has proposed a modernization program for the Ukrainian Armed Forces’ fleet of Leopard 1 tanks, centered on replacing the original turret with the company’s modular Cockerill 3105 turret system. The proposal was presented during the Brussels European Defence Exhibition & Conference 2026, held from March 12 to March 14 in Brussels.
The proposed upgrade aims to convert Ukraine’s Cold War–era Leopard 1 platforms into modern fire-support vehicles with improved fire control, guided missile capability, and extended engagement range. According to company representatives speaking during the exhibition, the modernization concept follows successful field trials conducted in Ukraine using a prototype vehicle equipped with the new turret.
Prototype Testing in Ukraine
A prototype Leopard 1 tank fitted with the Cockerill 3105 turret was delivered to Ukraine in May 2025 for technical and operational evaluation. According to information presented at BEDEX 2026, the test platform remains in Ukraine and has completed its initial assessment phase.
Company officials stated that the vehicle is expected to be deployed to an operational combat unit, marking the first potential front-line use of the upgraded configuration. The results of these trials form the basis for the proposal to upgrade the Ukrainian Armed Forces’ entire Leopard 1 fleet.
Ukraine currently operates Leopard 1 tanks supplied by several European partners, including Germany, Denmark, and the Netherlands. The modernization proposal is intended to extend the service life of these vehicles while improving their combat capabilities without requiring a new tank platform.
Cockerill 3105 Turret System
The Cockerill 3105 is a modular, lightweight turret designed for installation on legacy armored vehicle chassis. The system integrates a high-pressure 105 mm rifled cannon compatible with standard NATO ammunition used by the Leopard 1.
The gun is paired with an automatic loading mechanism located in the turret bustle, capable of holding between 12 and 16 rounds. The autoloader removes the need for a dedicated human loader, reducing the tank’s crew from four personnel to three.
The turret is operated by the commander and gunner, who are positioned at the level of the tank hull rather than inside the turret structure itself. Both crew members have access to identical stabilized sighting systems, allowing hunter-killer engagement capability where the commander can designate targets while the gunner engages another.
Fire Control and Optical Systems
The turret incorporates a fully digital fire-control system and advanced optical sensors. According to the manufacturer, the system can detect targets at distances of up to 18 kilometers during daytime conditions and 15 kilometers at night.
The weapon system supports high elevation angles, allowing the tank to perform indirect fire missions in addition to conventional direct engagement. Company representatives described the indirect-fire capability as uncommon among Western tank platforms.
Guided Missile Integration
The 105 mm cannon is also capable of firing the Falarick 105 guided anti-tank missile. The missile was originally developed in the 2010s by Ukraine’s Luch Design Bureau in cooperation with John Cockerill.
Falarick uses laser beam-riding guidance and is designed to be launched directly from the tank gun barrel. The missile can engage armored vehicles, fortifications, and low-flying helicopters at distances of up to approximately 5 kilometers.
The tandem hollow-charge warhead is reported to be capable of penetrating at least 550 millimeters of armor behind explosive reactive armor (ERA).
Protection and Structural Design
The Cockerill 3105 turret is constructed from welded ballistic aluminum and can be fitted with modular armor packages. With additional protection kits installed, the turret is rated to STANAG 4569 Level 5, which provides resistance against 25 mm autocannon or sub-caliber ammunition.
Secondary armament typically includes a 7.62 mm coaxial machine gun and a 12.7 mm heavy machine gun mounted externally.
The turret is approximately 3.5 tons lighter than the original Leopard 1 turret, which may improve vehicle mobility without requiring modifications to the engine or transmission.
Integration with Leopard 1 Hull
Installation of the turret requires an adapter ring to interface with the Leopard 1 hull, along with integration of the electronic control systems. According to the manufacturer, the modification involves relatively limited structural changes to the existing chassis.
Despite the improvements in firepower and fire-control systems, the modernization does not significantly increase the protection level of the Leopard 1 hull itself, which remains comparatively thin by modern main battle tank standards. Analysts note that the upgrade focuses primarily on enhancing long-range engagement capability and situational awareness rather than heavy armor protection.
Fleet Modernization Proposal
The proposal from John Cockerill Defense would allow Ukraine to upgrade its Leopard 1 fleet into modernized fire-support platforms capable of using advanced optics, guided missiles, and automated loading systems.
The company positions the Cockerill 3105 as a flexible turret system suitable for multiple tracked and wheeled vehicles. Similar configurations have been proposed for other legacy tanks, including the M60 Patton family.
Discussions regarding the potential modernization program, including cost and production timelines, are continuing between the Belgian manufacturer and the Ukrainian Ministry of Defense. If adopted, the upgrade would represent a significant attempt to extend the operational relevance of Leopard 1 tanks currently in Ukrainian service.
——— End of Article ———
