# Improving emergency preparedness of subnational vaccine stores in Ukraine: co-creation and implementation of on-site functional simulation exercises

## TL;DR

This paper describes how Ukraine improved vaccine storage emergency preparedness through on-site simulations during the war, helping stores handle power outages and transport issues.

## Contribution

The novel approach of co-creating and implementing on-site functional simulation exercises to strengthen vaccine cold chain emergency preparedness in conflict settings.

## Key findings

- Simulation exercises revealed gaps in alert systems, backup storage, and staff training.
- Tailored action plans improved technical readiness and role clarity among staff.
- The model is cost-efficient and replicable for other public health functions in conflict zones.

## Abstract

The ongoing war in Ukraine has severely disrupted the health system, with repeated attacks on energy and health infrastructure, as well as damage to transport routes, posing a major threat to maintaining the vaccine cold chain. In this context, the authorities, along with WHO, took action to strengthen the preparedness of subnational vaccine stores to effectively respond to emergencies and minimize the risk of temperature excursions during vaccine storage and transportation.

Ukraine’s vaccine cold chain operates through 25 newly established subnational vaccine stores. These facilities play a critical role in storing and distributing vaccines to lower levels of the health system. Following recent modernization, most stores use WHO-prequalified cold chain equipment, remote temperature monitoring, power backup systems, and specialized vehicles. However, the ongoing conflict exposes them to frequent disruptions in power, logistics, and communications.

To address this need, we co-created on-site functional simulation exercises. The 7-h programme combined a locally led risk analysis with three progressively complex simulated emergencies, testing responses to equipment failure, prolonged power outages, and transport incidents.

Between July and November 2025, simulation exercises were conducted in 18 oblasts, revealing recurring gaps in alert systems, backup storage and transport capacity, procedures implementation, and staff training. After the exercises, each store developed a tailored action plan to address these. Participant feedback indicated improved technical readiness, clearer roles and responsibilities.

Co-created, on-site simulation exercises proved effective and cost-efficient for enhancing cold chain preparedness, offering a replicable model for other public health functions in conflict settings.