Dan Jarvis MBE MP was appointed as UK Secretary of State for Defense on Thursday 11 June 2026, following the resignation of John Healey amid months-long dispute over military spending, and accusing Prime Minister of failing to commit the resources needed to keep the country safe from mounting threats, especially Russia.

Healey said a draft for the Defence Investment Plan (DIP) "falls well short of what is required for defence...at this dangerous time".

Healey accused the prime minister of failing to commit the resources needed to protect the country from rising threats.