Here’s his letter.
^This new era for defence required further investment through the Defence Investment Plan. The excellent and extensive cross-government work that completed in January-overseen by you, me and the Chancellor - confirmed the scale of the challenge and the rising demands on defence.^
^Since then, you have been unable, and the Treasury has been unwilling, to commit the resources that the nation needs to defend the country at this time of rising threats.^
^"As I've outlined to you, there are credible ways of meeting the mid-term funding challenges, working multi-nationally and as other European nations are doing, to allow us to protect our ability to deliver the missions of our Labour Government.^
^"You know what defence needs. You made the argument for this powerfully in your speech at the Munich Security Conference back in February. Without a DIP (Defence Investment Plan) that meets the moment in this way, I am being forced to make decisions that would reduce the readiness of our Forces and increase the risk to personnel on operations, and could make the country less safe."^