Poland and United Kingdom Sign Comprehensive Security and Defence Treaty (gov.uk)

• Bilateral security and defence treaty signed 27 May 2026
• Russia identified as most significant long-term threat
• Commitment to strengthen NATO eastern flank and support Ukraine
• Enhanced cooperation in defence industry, cyber, and energy security

"Poland and the UK signed a bilateral security and defence partnership treaty on 27 May 2026, committing to deepen cooperation in foreign policy, defence, national security, economic security, and energy climate security. The treaty identifies Russia as the most significant long-term threat and reaffirms commitment to NATO and support for Ukraine."