Keir Starmer is heading for a crucial Nato summit today vowing to hit a new target for defence budgets.
The PM will join fellow leaders from the military alliance in The Hague after signing up to the goal of spending 3.5 per cent of GDP on defence.
Another 1.5 per cent will be committed to related measures such as cyber security, under the package demanded by Donald Trump.
However, ministers have refused to say where the UK will find the extra money - around £30billion on top of existing plans - with Rachel Reeves already scrambling to balance the books.
There are also claims that the figures are being fiddled and countries are watering down the pledges.
