When the UK allowed Ukraine to use British-supplied Storm Shadow cruise missiles against targets inside Russia in late 2024, Moscow predictably accused London of escalating the war and threatened retaliation.

Russia’s latest warnings over Kyiv’s use of British-made drones that “the deeper its involvement in the conflict… the higher the price it will pay” may therefore sound familiar. But there is an important difference: scale.

With a range of 250km, Storm Shadow has given Ukraine an extremely capable weapon for striking high-value targets behind Russian lines. But Britain and its allies possess finite inventories of the expensive cruise missile. Replenishing stocks takes time, money and industrial capacity, placing a practical ceiling on their use.

Long-range drones could loosen that constraint. They may carry smaller warheads and be considerably easier to intercept than a cruise missile but they are far cheaper and easier to manufacture. If Britain and Ukraine produce them in sufficient quantities, their significance will lie less in what any single drone can destroy than in the cumulative effect of repeated mass strikes deep inside Russia.

This does not make drones infinitely scalable. Production depends on components, manufacturing capacity and secure supply chains, while their effectiveness depends on overcoming Russian air defences and electronic warfare. But these differ from the finite inventories limiting cruise missiles.

The UK now has a substantial uncrewed-systems sector. Its drone programmes include the jet-powered Nyan, AR3, K3 Scout and Octopus, spanning long-range strike, surveillance, maritime autonomy and counter-drone warfare respectively. They are backed by the Uncrewed Systems Centre in Swindon, which the........

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