Keir Starmer will travel to the NATO summit in Ankara with fewer than two weeks left in office. Downing Street has confirmed this will be his final international trip as prime minister, and it's being framed around pushing what No. 10 calls a "stronger and more European NATO," according to The Guardian.

The timing is complicated. Andy Burnham, described as "the prime minister in waiting," is already in transition talks with the civil service. Starmer arrives in Ankara carrying both the weight of an outgoing leader and the responsibilities of a sitting prime minister—a tension that will define his visit.

The Defence Spending Conflict

The real friction at the summit comes down to money. The gap between what Washington wants NATO allies to spend on defence and what European countries can actually afford has long been contentious. Donald Trump is expected to publicly criticize allies, including the UK, for not moving quickly enough toward a target of spending 3.5% of their annual economic output on defence by 2035. The U.S. ambassador to NATO has already signaled this, saying publicly that "some allies are doing more than others."

Downing Street pushed back hard on that criticism. The prime minister's official spokesperson rejected it entirely, telling reporters: "We reject these claims. The UK has always met its NATO spending commitments and remains one of the top defence centres in the alliance."

But the numbers tell a mixed story. The UK is NATO's third-largest contributor in actual dollars, behind only the United States and Germany. When you measure it differently—as a percentage of what each country's economy produces—the UK ranks 14th out of 32 alliance members. No. 10 has promised to increase defence spending to 2.7% of GDP by 2027–28 but hasn't committed firmly to hitting 3% by the end of the decade. This gap is what will come under scrutiny in Ankara.

There's an additional political problem: a domestic claim that Starmer is leaving his successor a £5 billion funding gap in defence projects. Downing Street hasn't fully addressed that charge, and it will shape the debate during the leadership handoff about whether the UK's long-term spending promises are actually credible.

Building a United European Front

Starmer isn't planning to go to Washington hat-in-hand. The British strategy is to show Trump that European leaders are coordinated. They intend to present him with a unified argument: that defence spending commitments are translating into real military capability, and that countries are already sharing the burden more fairly than the rhetoric suggests.

The groundwork for this message was laid carefully before the summit. Starmer met NATO Secretary General Mark Rutte on 18 March, spoke with him again on 13 June, and hosted him in London on 29 June, with NATO confirming that the visit was specifically to align on summit priorities. A joint E5 leaders' statement on 24 June committed key European allies collectively to achieve results in Ankara. Another joint statement on 7 June involving Starmer, French President Macron, German Chancellor Merz, and Ukrainian President Zelenskyy was part of the same strategy—building a European position before the full summit opened.

Rutte himself has framed Ankara as an implementation moment rather than a time to set new rules, noting in June that "NATO 3.0 is really happening." That framing helps European leaders argue that progress is being made without admitting that targets have been missed.

The Russian Threat

No. 10 released figures designed to put the spending debate into real-world context: Russian military vessels in or near UK waters have increased by 30% over the past two years, and NATO has scrambled fighter jets more than 700 times to intercept Russian aircraft heading toward allied airspace. These numbers form part of the UK's argument that the alliance is already under active pressure—a fact that suggests solidarity matters more than arguing about who's done enough.

The broader context here is important. Starmer is visiting Ankara at one of NATO's most critical moments in recent memory while facing two disadvantages: his government's unresolved spending questions and a successor—Burnham—who hasn't yet been tested internationally. This forces No. 10 to make a careful argument: not just to the alliance, but to the incoming government that follows the rules already set.

What Starmer Can Actually Achieve

Trump's schedule reveals something by itself. He's expected to hold bilateral talks in Ankara with Zelenskyy, but Starmer will likely encounter him only in plenary sessions or brief sideline conversations. The prime minister's spokesperson said no confrontation was anticipated—an oddly defensive frame, since someone apparently asked the question. UK officials are instead billing the summit as a platform for announcing defence industry deals and joint military projects with allies, giving Starmer something concrete to take home.

The real constraint is structural. Starmer is attending a pivotal NATO summit as a departing leader with a defence spending riddle still unsolved at home and a successor who hasn't yet proven himself on the world stage. No. 10's insistence that Britain's commitment "will not waver" is aimed as much at Burnham's incoming administration as at NATO itself—a promise of continuity that only the next government can actually keep.