The contract, awarded following a competitive pitch, encompasses strategic comms advice, assessment and evaluation, design, branding and advertising, marketing and PR, broadcast video, digital and social media. It covers NATO across its 28 member states and beyond.
It makes Agenda and Engine preferred suppliers to NATO effective immediately, with the first briefs through the framework due to be submitted shortly. There are also two other agencies on the framework, but Engine said it had not been told who these were.
A spokesman for Engine could not immediately confirm which agencies had previously held the framework.
Agenda founding partner Doug Turner said: "This was a long and highly competitive process and we are honoured to have the chance to do important work for such a storied institution, and equally pleased to be partnered with Engine on this effort.
"There is no greater challenge - and reward - than helping the Alliance deal with a new generation of security threats."
Simon Peck, who in March became UK MD of Engine UK – the brand that owns PR agencies MHP and Mischief – said: "We are excited to be working with such an illustrious and important institution, as it tackles some of the most fascinating challenges of our time."
Headquartered in Brussels, Belgium, NATO was founded through the 1949 North Atlantic Treaty. It currently counts 28 countries as members.
- This article was amended on 23 September after Engine told PRWeek that there were two other unnamed agencies alongside it on the supplier framework.