Keir Starmer warned that Vladimir Putin must be stopped in Ukraine to protect the rest of Europe today as he put the UK on a war footing.
The Prime Minister pledged to accelerate an increase in the UK's defence spending in the face of Russia's belligerence and growing US indifference to European security.
He vowed to increase cash to 2.5 per cent of UK GDP by 2027 - which he said amounted to an extra £13.4billion - ahead of a crunch visit to see Donald Trump later this week.
The premier said it amounted to the 'biggest sustained increase since the end of the Cold War', and will rise to 3 per cent 'in the next Parliament', after 2029.
The uplift will be paid for by cutting to foreign aid budget, but Sir Keir defended the move saying that the defence cash would boost 'British jobs, skills and investment'.
