The United Kingdom, the Netherlands, Finland and Poland have been developing the Multilateral Defence Mechanism (MDM) with partners to aggregate demand and enable joint procurement, according to a joint statement published on 28 October 2026.

The statement said the MDM is intended to reduce costs, give industry greater certainty, deliver better value for money and improve joint NATO capabilities, ultimately meeting members' military needs. It added that closer cooperation among allies would help underpin increases in defence capability and value from increased spending.

The four countries said MDM partners would begin treaty negotiations, respecting individual members' national processes, while maintaining the aim of having the mechanism up and running in 2027.