Brexit would be more than a matter of economics and a loss of British influence; it would also have a geopolitical impact. Over the past two decades the EU has become a significant part of the West's foreign and security structure, alongside NATO. It was the EU that joined America in devising and implementing sanctions against the Russians after they annexed Crimea and invaded eastern Ukraine. It is the EU that, in fits and starts, has grappled with the continent's recent influx of refugees and migrants.
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