The UK said on Tuesday that the “free and open internet” was at risk from censorship by China and Russia, with western allies in a race to write the rules governing cyber space. The warning was contained in a document setting out the country’s new cyber strategy, which predicted a “clash of values” between world powers as the UK developed its cyber warfare capabilities. The National Cyber Security Centre (NCSC), the defensive arm of the signals intelligence agency GCHQ which helped develop the strategy, said the new approach would act as a blueprint for countering the increasing number of cyber...