The U.K.’s chief negotiator called on the European Union to show “pragmatism and common sense,” instead of threatening to retaliate, as the two sides meet to resolve differences over the deal that was supposed to keep trade flowing after Brexit, the Associated Press reported. David Frost made the comments after his EU counterpart said the bloc was ready to act “firmly and resolutely” if the U.K. fails to honor its commitments under the divorce agreement. The two men are scheduled to meet Wednesday in London amid rising tensions over implementation of the deal in Northern Ireland, the only part of the U.K. that shares a land border with the bloc. Central to the talks are provisions of the deal that effectively created a customs border between Northern Ireland and the rest of the U.K., angering many pro-British residents of the island. While Britain has called for compromise, the EU says the new rules are needed to protect the bloc’s single market. Both sides fear the tensions could fuel a return to violence in Northern Ireland. Read more.