June 2026 will mark four years of Operation Interflex, a UK-led multinational training programme that has trained more than 63,000 Ukrainian personnel as infantry soldiers, leaders and instructors.

The new phase of the UK’s training support for Ukraine has been announced, which sees an expansion into specialist areas including aviation, medical, engineering and logistics.

New training framework will incorporate helicopter instructor training, which saw the first trainees graduating last month, as well as other training including medical and engineering.

Operation Interflex launched in the wake of Putin’s full-scale, illegal invasion of Ukraine. Its original mission was to deliver basic infantry training at pace and at scale, enabling Ukrainians with little or no prior military experience to defend their country against Russia’s unprovoked aggression.

Over the past four years, Interflex has developed into a highly successful and valued internationally recognised training programme.

Supported by personnel from 13 partner nations, it has delivered basic infantry training alongside leadership and instructor courses. In addition, it has delivered bespoke mental resilience training to 375 Ukrainian combat psychologists since 2024.

Since its inception 63,000 Ukrainians have completed Interflex training, including 11,000 military instructors, providing a vital boost to Ukraine’s own training system.

As it enters its fifth year, Interflex will transition into a new, unified framework, bringing all UK‑led training for Ukraine, in the UK and overseas, under a single name.

In line with the changing requirements of the AFU, the programme will move away from large‑scale infantry training and towards specialist and advanced training designed to build long-term capability.