Corbyn plans to say today that military interventions since 2001 have not only failed to stop the threat of violent attacks, but may have worsened it.
He says intelligence and security experts "have pointed to the connections between wars our government has supported or fought in other countries and terrorism here at home." The Labour Party released advance extracts from Corbyn's speech, in which he promises to "change what we do abroad."
The speech will inflame a fierce debate about whether British military involvement in Afghanistan, Iraq and Libya helped fuel extremist violence.
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