Relations between Brussels and London have soured in recent weeks after Britain, unhappy with the deal it signed up to in 2020, threatened to trigger an emergency clause known as Article 16, potentially leading to a trade war.
UK Prime Minister Boris Johnson is welcomed by European Commission President Ursula von der Leyen prior to a working dinner at the EU headquarters in Brussels, Belgium, on Dec. 9, 2020. Olivier Hoslet/Pool/AFP via Getty Images
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