Nato's chief will heap pressure on Keir Starmer today as he urges a huge boost in spending.
Mark Rutte is set to hold talks with the PM in London and deliver a speech warning of the need for a 'quantum leap' in investment.
After pressure from Donald Trump, states are expected to be asked to agree to commit 3.5 per cent of GDP by the 2030s at a summit later this month. A further 1.5 per cent would be required for defence-related measures.
However, there are questions about how the UK would fund such a huge increase - roughly equivalent to an extra £30billion annually.
Britain allocated 2.33 per cent of GDP to defence last year, and Sir Keir has committed to reaching 2.5 per cent by April 2027.
