Ben Wallace, the UK Defence Secretary, has said the British army has been "neglected" over the past two decades.
Mr Sunak's short-lived predecessor Liz Truss had pledged to spend 3 per cent of GDP on defence by 2030.
“We’re investing £24 billion ($29 billion) into the army’s equipment programme between now and the end of the decade," Mr Wallace said.
“That’s a lot of money. Because quite rightly, the army needs to catch up.
“It has been neglected by quite a few people over the last two decades, I’d say at least. So it needs to be modernised.
“We need to rapidly look at the lessons of Ukraine because they have actually given us an opportunity to see not only where we’re vulnerable, but actually have you got the balance of investment right within the army.”