UK and Ireland Sign Refreshed Defence MoU to Enhance Joint Procurement and Maritime Security

Homeland April 2, 2026

UK and Ireland Sign Refreshed Defence MoU to Enhance Joint Procurement and Maritime Security

The UK Ministry of Defence and the Irish Department of Defence have formally signed an updated Memorandum of Understanding (MoU) aimed at deepening bilateral defence cooperation in response to evolving regional security challenges. Signed by the Secretary of State for Defence and the Irish Minister for Defence, Helen McEntee, during the UK-Ireland Leaders’ Summit in Cork, the agreement modernises a cooperation framework that has been in place since 2015. This refreshed accord specifically targets four critical pillars: maritime security, cyber defence, air domain information sharing, and joint procurement initiatives.

For the UK defence supply chain, the most significant development within the MoU is the explicit commitment to explore opportunities for the joint procurement of military equipment and the facilitation of new Government-to-Government sales. This policy shift indicates a move toward a more integrated approach to capability acquisition between the two nations, potentially opening new channels for UK-based contractors and sub-contractors to engage with the Irish Defence Forces. The agreement also emphasises the necessity for enhanced maritime security cooperation, with a primary focus on protecting critical undersea infrastructure and developing improved joint response mechanisms to maritime security incidents in shared waters.

In addition to procurement and maritime safety, the MoU prioritises increased information sharing and situational awareness within the air and cyber domains. These measures are designed to bolster national resilience against sophisticated digital threats, suggesting a sustained requirement for technical solutions in cyber defence, data encryption, and surveillance systems. The agreement also maintains the existing focus on established cooperation in UN peacekeeping, crisis management, and humanitarian operations. Furthermore, it outlines continued joint support for Ukraine as members of the “Coalition of the Willing,” providing a framework for ongoing industrial and logistical collaboration in international military aid efforts.

The transition from the previous 2015 agreement reflects a strategic update necessitated by the current geopolitical climate and fulfils a commitment made during the 2025 UK–Ireland Leaders’ Summit. While respecting the distinct defence and security policies of each nation, the modernised MoU provides a more agile foundation for operational and industrial synergy. Businesses operating in the maritime, aerospace, and digital security sectors should monitor these developments closely, as the emphasis on undersea protection and cyber resilience points toward specific areas of future government engagement. This revitalised partnership underscores a shared recognition of the interdependence of UK and Irish security, offering a more formal and transparent footing for long-term defence-industrial cooperation.