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Explained in plain English

What is declassification?

Declassification is when a government removes the secrecy status from documents or information, making it publicly available. In this story, the UK is declassifying information about missile components, allowing Ukraine to use this knowledge to build its own long-range missiles. This transfer of previously secret technical details is a significant step.

Stories that explain this

Burnham visits Kyiv, promises Ukraine help making missiles

Related explainers

Why is Moscow unhappy? Why does Ukraine need missiles? What is the 'decline' narrative? Why declare an emergency? What is decriminalisation? Why declare a 'significant incident'?

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