Sir Keir Starmer’s pledge to deploy British peacekeepers to Ukraine has sparked debate over whether the UK is prepared for direct conflict.
The Labour leader has held talks with European allies about sending a “reassurance” force to Ukraine to protect against future Russian attacks. The discussions follow what Starmer called a “historic” White House summit on Monday, hosted by Donald Trump and attended by eight European leaders, including Ukrainian President Volodymyr Zelensky.
Starmer has stated that the UK is “ready to put boots on the ground and planes in the air” in support of a peace deal, and is pushing for a “coalition of the willing” to bolster Ukraine’s defences. Meanwhile, Trump has ruled out sending US troops.
The Prime Minister has also committed to increasing UK defence spending, arguing that “tyrants” like Russian President Vladimir Putin “only respond to strength.” Initial plans to raise spending to 2.5% of GDP by 2027, with a longer-term target of 3%, have since been revised to a NATO-aligned 5% commitment.
UK Military Strength: Then and Now
Latest Ministry of Defence figures (April 2024) show the UK’s armed forces remain smaller than during the Cold War. Key highlights:
- Challenger II tanks: 219 (up from 213)
- Ajax armoured vehicles: 128, but only 91 operational
- F-35 jets: 35 (4 added in the past year)
- Typhoons: 137
- Submarines: 10
- Destroyers: 6
- Frigates: 12
While the UK has fewer personnel and ships than in 1984, modern technology has significantly improved capabilities. Jets now function like “flying supercomputers,” submarines are harder to detect, and warships are designed to counter high-speed missiles.
Yet experts warn that sheer numbers still matter in sustained combat. Many armoured vehicles and ships are decades old. Some Challenger tanks are undergoing upgrades, temporarily reducing available numbers. The oldest Type 23 frigates are over 30 years old, well beyond their intended lifespan.
Spending and Stockpiles
The UK currently spends 2.3% of GDP on defence, set to rise to 2.5% by 2027. Experts argue this is barely enough to maintain existing capabilities.
“Matching 2.5% won’t materially improve UK defence,” said Stuart Young, former Royal Navy engineer and visiting fellow at Cranfield University. “It’s enough to play catch-up on stockpiles and equipment.”
The war in Ukraine has strained UK resources further. Since February 2022, the UK has pledged £7.8bn in military aid, including tanks and missiles directly from stockpiles. Replenishing equipment could take four to five years.
Personnel Shortages
Britain’s armed forces are down 45% compared with 1984, with roughly 180,000 personnel. Only 127,000 are fully trained, leaving 53,000 untrained or reserve personnel.
Recruitment and retention remain critical challenges. Army pay struggles to compete with the civilian sector, and living conditions for service members have declined, prompting skilled personnel to leave.
“Training takes time,” Young said. “Even if you recruit today, it could be three to five years before fully trained troops are ready.”
Lessons from Ukraine
Security analysts warn that the war in Ukraine shows high-intensity conflicts can last far longer than expected. The UK military, according to a 2025 defence committee report, is “unable to devote sufficient training and resources to high-intensity warfighting” for extended periods.
Former defence committee chair Sir Jeremy Quin told MPs that the armed forces are currently prepared for only a few months of sustained combat.
As Starmer pursues a “coalition of the willing” and increased defence spending, experts stress that rebuilding stockpiles, modernising equipment, and growing personnel numbers will take years, raising questions about whether the UK can act swiftly if boots are sent to Ukraine.
