From the pandemic to President Joseph Biden’s election, the January 6 insurrection, and the vaccine rollout, a lot has changed in the last 18 months. One thing that hasn’t? Brexit, Britain’s exit from the European Union, is still a hot mess. The latest chapter in the saga has the British government threatening to go “nuclear” and invoke Article 16 of the Northern Ireland Protocol—not good for already tense U.K.-E.U.