A groundbreaking UK-led study has for the first time illuminated the harrowing experiences of American and British military veterans who have volunteered to fight in Ukraine following the conflict’s sharp escalation in 2022. These volunteer fighters face extraordinarily intense combat conditions marked by persistent drone warfare and grueling trench combat. Critically, they undertake these missions with minimal formal training or logistical support from the Ukrainian military, exposing them to amplified mental and physical health challenges often left unaddressed both during deployment and upon their return home.
Led by Dr. Victoria Williamson of the University of Bath’s Department of Psychology, the investigation employed comprehensive psychological evaluations and in-depth interviews with 31 US and UK veterans embedded in frontline Ukrainian units. Their testimonies reveal a combat environment fundamentally distinct from previous Western engagements in Iraq or Afghanistan, where troops operated within structured military frameworks offering clear command, lawful engagement rules, preparatory training, and systematic post-deployment care. Instead, these volunteers navigate unpredictable warzones, often self-deployed, with wildly variable access to leadership, equipment, and medical resources.
The study’s participants described frequent exposure to life-threatening scenarios involving drone strikes that engender constant threat anxiety, coupled with traditional close-quarter trench fighting where the risk of physical injury is acute. Yet, the Ukrainian armed forces provided scant formal preparation before embedding these foreign volunteers directly into frontline duties. Once wounded or psychologically distressed, many veterans reported minimal or poor-quality medical care in the conflict zone. Upon repatriation, untreated injuries and severe mental health conditions persist, exacerbated by inadequate follow-up or rehabilitation services within their home countries.
Mental health outcomes among these volunteers are notably concerning. High rates of probable post-traumatic stress disorder (PTSD), alongside common mental disorders such as depression and anxiety, were recorded. Additionally, elevated levels of alcohol misuse signify coping mechanisms that potentially worsen long-term wellbeing. A particularly striking psychological phenomenon observed is moral injury—an intense distress arising from participating in or witnessing acts that violate the individual’s core ethical convictions, often manifesting as profound guilt, shame, or moral disillusionment.
Repeated attempts to seek professional mental health support in Ukraine and upon return to the UK and US commonly resulted in barriers such as long waitlists, institutional rejection, or inadequate provision of tailored care. Consequently, these veterans often rely heavily on peer networks of fellow volunteers for emotional support during and after deployment. This self-reliant approach underscores the glaring insufficiencies in existing military and civilian healthcare infrastructures tasked with veteran care—systems not designed to encompass foreign volunteer combatants operating outside traditional service channels.
The scale of foreign volunteerism in Ukraine since 2022 has been significant, with estimates of up to 20,000 foreign nationals applying to join Ukrainian forces, including approximately 3,000 Americans enrolling in the International Legion. Motivations range from political convictions to personal principles. However, their unofficial status places them beyond the reach of established military welfare and clinical support frameworks. This lack of formal integration risks leaving their complex medical and psychological needs invisible and unaddressed, with profound implications for their long-term health and social reintegration.
Dr. Williamson emphasizes the urgency of constructing coordinated, targeted clinical pathways explicitly designed for this unique cohort. Unlike veterans from formal Western military units, these volunteers experience a constellation of stressors inherent to irregular warfare contexts. The gap in understanding and service provision not only jeopardizes individual recovery but also threatens to compound societal costs related to untreated combat trauma and physical disabilities. She advocates for cross-sector collaboration between health services, veteran organizations, and international partners to ensure timely and effective care.
Furthermore, the research draws attention to the broader mental health impacts of modern high-intensity conflicts beyond registered military personnel. For instance, escalating tensions and hostilities in regions such as the US/Israel/Iran war have unleashed large-scale drone and missile attacks on civilian infrastructure, schools, and airports, causing mass displacement and destruction. These dynamics impose significant psychological strain on both combatants and civilian populations alike, underscoring a global imperative to prioritize accessible psychological support across all affected demographics.
The methodology for this study combined quantitative psychological assessments with qualitative interviews, enabling a holistic understanding of the operational realities and health consequences experienced by these volunteer fighters. As one of the pioneering scientific efforts in this domain, it involved collaboration between the University of Bath, King’s College London, Combat Stress, and Compass Pathways. Collectively, these institutions bring expertise spanning clinical psychology, veteran affairs, and innovative mental health treatment pathways, enriching the study’s depth and relevance.
This research marks a paradigm shift in recognizing the complexities of modern volunteer combat roles, highlighting the urgent need for military and civilian healthcare systems worldwide to adapt. The findings challenge existing assumptions that effective veteran support hinges solely on formal military affiliation, advocating instead for a more inclusive, responsive approach that accommodates diverse patterns of warfare and combat service. Without such reforms, volunteer veterans risk falling into a liminal space of neglect, with lifelong consequences for their physical and mental wellbeing.
In sum, this landmark study reveals a pressing humanitarian and clinical concern that extends beyond geographic and military boundaries. It calls for an integrated, compassionate response that bridges gaps in care provision, ensuring that all who endure the traumas of 21st-century warfare—regardless of official status—receive the recognition, treatment, and support they critically require. As conflicts grow increasingly complex and diffuse, so too must the systems designed to safeguard the health of those who serve, in whatever capacity.
Subject of Research: People
Article Title: Volunteering for Ukraine: Scoping the Operational Experiences and Impacts Among UK and US Veterans
News Publication Date: 23-Mar-2026
Web References:
http://dx.doi.org/10.1080/20008066.2026.2641410
Keywords:
Volunteer fighters, Ukraine conflict, combat trauma, PTSD, moral injury, veterans’ mental health, drone warfare, frontline combat, healthcare access, military veterans, trauma-related distress, international volunteers
