One usually thinks of diplomacy as something conducted at state level by presidents and prime ministers. But nation-states are no longer the sole actors in the international arena. Cities and sub-state governments are transforming the way we conduct foreign affairs. How does paradiplomacy work? And what makes a good paradiplomat? Andrew Mueller speaks to the mayor of Tirana, Erion Veliaj, Professor Michael Keating and Kate Sanderson, head of representation of the Faroe Islands in London.

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