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Storm Shadow blueprints: what Britain promised Kyiv
Summary
A look back at the visit on which the British prime minister confirmed that Ukraine would receive the designs to build the cruise missile.
What did Britain's prime minister actually commit to when he visited Kyiv? By 26 August 2026, the answer had been public for two days: Andy Burnham confirmed on 24 August that he had approved supplying Ukraine with the classified blueprints to produce Storm Shadow cruise missiles.
As reported at the time, the decision came despite Russian threats against such a move. It was set to give Ukrainian forces the ability to strike key targets deep inside Russian territory.
A threat Moscow had made before
Russia's government had threatened retaliation against countries supplying military aid to Ukraine, and had said such support meant NATO was waging a proxy war against Russia. Later accounts noted that Moscow had not followed through on those threats, even as most of its stated red lines were crossed.
Europe's growing share
The blueprint decision fitted a wider pattern in military aid. According to the Ukraine Support Tracker, Europe had surpassed the United States in total military aid to Ukraine by April 2025, with €72 billion allocated against €65 billion from the United States.
The announcement made in Kyiv shifted the discussion from supplying finished missiles to Ukraine producing them itself.
