The European Union has just imposed a visa ban on serving and former Russian soldiers. Implementation will not be easy – how do you tell if an applicant has served in the military? – but the principle is sound: those fighting for a state that threatens Europe should not expect to holiday there.

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Toby Young

Professor Arday is the gift that keeps on giving

This revives a broader debate. Who from Russia should Europe admit? Russia launched the largest invasion in Europe since 1945. It is conducting a campaign of espionage, sabotage and assassination across the continent. Its leaders openly describe relations as a state of war. In these conditions, immigration policy is an integral part of security.