With only a few days to go until the UK’s referendum on EU membership, both sides of the campaign are making their final appeals to the electorate. Gijs de Vries writes that the UK has played a leading role at the EU level in efforts to tackle terrorism, ensure security, and deal with external threats such as the Iranian nuclear programme and Russia’s annexation of Crimea. He argues that Brexit would leave British citizens less secure, Europe weaker, and the UK a smaller country on the global stage