Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. EU, UK Each Demand Concessions as Post-Brexit Talks Stall Agence France-Presse BRUSSELS - British and EU negotiators have dug in their heels and each is demanding more concessions from the other as post-Brexit trade talks dragged on into Sunday, deadlocked on fishing rights. Sources from each side said that unless the other backed down on access to U.K. waters, Britain would leave the single market at midnight December 31 without a deal on cross-channel commerce. "We're continuing to try every possible path to an agreement, but without a substantial shift from the [European] Commission we will be leaving on WTO terms on 31 December," a British government source said. But an EU diplomat told Agence France-Presse that Brussels had made Britain its last offer on fishing and it was down now to U.K. Prime Minister Boris Johnson to decide whether he wanted a deal. "If Britain doesn't accept the latest EU offer, it will be a 'no deal' over fish," he warned. A European official said: "It's very blocked." The tough talk came as both sides engaged in intense negotiations to secure a pact before the end of the month. No deal would risk chaos at EU and U.K. borders, where a pre-deadline rush has caused long lines of lorries. Observers, however, noted that the fishing issue was about finding middle ground between offer and counteroffer in an economically small sector, while the much bigger other main issue, on guaranteeing fair trade competition rules, was closer to settlement. "It's all down to numbers now," the European diplomat said. .