UK Defence Secretary Dan Jarvis has pressed Andy Burnham, Labour's prime minister-in-waiting, to commit publicly to a faster climb in defence spending after 2030, specifically toward NATO's 3.5% of GDP target. Speaking ahead of the NATO summit in Ankara opening on Tuesday, 7 July, Jarvis asked Burnham to "evidence the trajectory" — a pointed request for proof, not just promise. The government under Keir Starmer has committed only to 2.68% by 2030, per The Guardian. The gap matters. At current economic scale, reaching 3.5% would require roughly £25bn a year more for the military by the mid-2030s than presently planned.

The 3.5% commitment itself is not new or theoretical. NATO members agreed to it in 2025 under sustained pressure from US President Donald Trump, and it carries weight in alliance negotiations. Jarvis signalled to US Defence Secretary Pete Hegseth at the summit that the UK intends to meet that pledge — a statement aimed at bilateral reassurance as much as alliance-wide credibility.

The politics behind the pressure are worth understanding. John Healey resigned as defence secretary in June 2026 because Starmer refused to lock in a steeper trajectory beyond 2.68%. His departure was public and deliberate. Jarvis, a former paratrooper, took the role and moved quickly to stabilise the position. He secured an additional £1.5bn over four years — partly earmarked for drone procurement — as part of the £298bn four-year Defence Investment Plan (DIP) announced in late June. The plan was formally unveiled on 30 June in Berkshire with Starmer present, allocating £5bn specifically for drones. These additions amount to roughly $20bn in extra spending, funded partly by redirecting money away from road and energy projects. Jarvis described the trade-offs as "difficult but necessary." Reuters reported on the drone focus; the broader funding mechanism drew immediate scrutiny.

That scrutiny deepened quickly. By 1 July, a Reuters analysis had identified a £4.7bn ($6.2bn) funding shortfall within the existing DIP that Burnham would inherit and need to close. Al Jazeera separately reported questions about whether Burnham had been fully briefed on the scale of the problem before it went public. Burnham's response, in a 2 July interview, was unambiguous: he would "fully fund" the Defence Investment Plan with "no compromise on the security of the nation." What remains unclear — and is precisely what Jarvis is pressing him to clarify — is whether that commitment extends to the post-2030 push toward 3.5%, or only covers the existing four-year plan.

Jarvis has already been in contact with Burnham and his team about defence priorities and DIP specifics. That channel matters. It suggests working coordination rather than public confrontation, even as Jarvis's public framing carries unmistakable pressure.

The broader context here is the Ankara summit itself, which adds diplomatic weight to the conversation. Jarvis travels with Prime Minister Starmer and Foreign Secretary Yvette Cooper. The agenda is dense with burden-sharing politics. Trump's sustained push for European allies to hit 3.5% has made summit performance consequential for domestic political standing as well as alliance management. NATO Secretary-General Mark Rutte said on 29 June he was "confident" Burnham would honour UK spending commitments — a carefully worded statement designed to reinforce rather than simply endorse.

Meanwhile, operational demands are accumulating. The UK is preparing a major sustained deployment to safeguard the Strait of Hormuz alongside France. Jarvis described the current security environment as "absolutely more dangerous and more complicated than at any point during my lifetime" — words that carry particular weight from a former paratrooper with field experience, and that frame the 3.5% discussion as more than internal party accounting.

The financial problem Burnham faces is straightforward in structure, harder in execution. Reaching 3.5% of GDP by the mid-2030s would require defence spending roughly £25bn a year beyond current plans — on top of the £4.7bn gap already identified in the existing DIP. The funding sources are unspecified. Cuts to other investment budgets, the mechanism Starmer used for the current uplift, have already triggered pushback from infrastructure and energy sectors. Tax increases and additional borrowing both carry political costs that Burnham's team has not yet publicly addressed. When Jarvis calls on him to "evidence the trajectory," he is asking for a credible fiscal path, not just a rhetorical pledge. The Ankara summit is where the UK will need to begin answering that question before its most demanding audience.