The United Kingdom and Ireland maintain a long-standing relationship in defence and security cooperation, including maritime awareness, crisis response and military training exchanges. Both countries face shared risks linked to undersea infrastructure protection, cyber resilience and regional security stability, which require coordination between neighbouring states.
The UK Secretary of State for Defence John Healey MP and Ireland’s Minister for Defence Helen McEntee signed a refreshed Memorandum of Understanding to strengthen UK Ireland defence cooperation. The updated agreement expands collaboration across maritime security, cyber defence, air information sharing and defence procurement as both governments deepen bilateral security coordination.
UK and Ireland sign updated defence cooperation agreement
The refreshed Memorandum of Understanding establishes a renewed framework for defence coordination between the United Kingdom and Ireland. The Ministry of Defence said the agreement formalises cooperation across multiple defence domains while recognising the distinct security policies of both nations.
The agreement builds on existing collaboration between the UK Armed Forces and the Irish Defence Forces in areas such as training, humanitarian operations and crisis management. According to the Ministry of Defence, the updated framework modernises bilateral cooperation in response to evolving security risks.
- Strengthened bilateral defence cooperation
- Modernised framework for military collaboration
- Continuation of existing operational partnerships
Cooperation areas under the new agreement
The updated MoU outlines several areas where the United Kingdom and Ireland intend to expand defence cooperation. According to the Ministry of Defence, these areas focus on maritime awareness, cyber resilience and improved coordination between defence institutions.
Additionally, the agreement introduces provisions to explore joint procurement initiatives and government-to-government defence equipment cooperation. The Ministry of Defence stated that the framework is intended to strengthen coordination between both defence forces.
- Maritime security cooperation
- Cyber defence coordination
- Air domain information sharing
- Joint procurement opportunities
Maritime security and protection of critical infrastructure
The updated agreement places emphasis on maritime cooperation between the two countries. According to the Ministry of Defence, the UK Armed Forces and Irish Defence Forces will strengthen their coordination in protecting maritime infrastructure and responding to security incidents at sea.
The agreement highlights the importance of protecting undersea infrastructure and improving shared maritime situational awareness. The Ministry of Defence said both governments intend to enhance response mechanisms for maritime incidents affecting the region.
Maritime Cooperation Focus
| Undersea infrastructure protection | Strengthened coordination to protect critical maritime assets |
| Incident response | Improved joint response mechanisms to maritime security events |
| Operational coordination | Closer cooperation between UK and Irish naval and defence authorities |
Wider defence collaboration and international cooperation
The agreement also confirms continued cooperation in areas such as military education exchanges and international security operations. The Ministry of Defence said both countries will maintain collaboration in crisis management and humanitarian response missions.
Additionally, the MoU references ongoing cooperation related to international security initiatives involving Ukraine. According to the Ministry of Defence, the two governments will continue exploring joint defence activities in support of wider international partnerships.
Areas of Defence Collaboration
| Training and education | Continued exchanges between UK Armed Forces and Irish Defence Forces |
| Crisis response | Joint cooperation during humanitarian or international emergencies |
| International missions | Coordination on multinational security initiatives including support to Ukraine |
Stakeholder Comments
Ministerial Comments
John Healey, UK Secretary of State for Defence said;
“The UK and Ireland share a long history of defence cooperation — from crisis management and humanitarian operations to training, military education and staff exchanges.
“This rebooted Memorandum of Understanding modernises our framework for cooperation on areas important to both our nations’ security, particularly undersea and cyber threats we face.”
Helen McEntee, Irish Minister for Defence said;
“It is appropriate that, after ten years, we refresh our Memorandum of Understanding and focus on areas including maritime, cyber defence, air information sharing and joint procurement initiatives.”
“The agreement also provides continued cooperation between Ireland and the United Kingdom on a more formal and transparent footing.”
In Conclusion
The refreshed Memorandum of Understanding updates the framework governing defence cooperation between the United Kingdom and Ireland. The agreement expands collaboration across maritime security, cyber resilience and information sharing while continuing established defence partnerships between the two neighbouring states.
The updated arrangement replaces the 2015 memorandum and reflects commitments discussed during the UK–Ireland Leaders’ Summit. According to the Ministry of Defence, the agreement provides an updated structure for cooperation between the UK Armed Forces and the Irish Defence Forces.
Sources: Ministry of Defence and The Rt Hon John Healey MP.
Prepared by Ivan Alexander Golden, Founder of THX News, an independent news organisation delivering timely insights from global official sources. Combines AI-analysed research with human-edited accuracy and context.
