"The stakes internationally are higher and higher, but politics is becoming more and more parochial." The scale of the trouble facing the European Union is hard to overstate. European Union diplomats were holding an emergency session on the margins of the summit meeting late Thursday to overcome the impasse in Wallonia. Politicians, he added, are thinking locally and "making calculations based on tiny things" - even when the consequences affect the way the European Union faces up to huge challenges. He says he worries that the accord could undermine public services and sectors like farming, and he appears determined to show he can squeeze concessions from the entire European Union and from Canada. "I think it's reasonable to postpone this summit " Mr. Magnette told Belgian national radio on Wednesday, referring to a signing ceremony, planned for next week, between the European Union and Prime Minister Justin Trudeau of Canada. Donald Tusk, the president of the European Council, which organizes the summit meetings, has urged leaders to take lessons from the backlash against globalization that was evident in the vote for Britain's withdrawal from the bloc, known as Brexit. "I'm afraid that it means that CETA could be our last free-trade agreement." Experts said the impasse created by tiny Wallonia threatens to plunge the European Union into still more troubled waters. On Thursday, the Dutch prime minister, Mark Rutte, was expected to appeal to fellow leaders to offer concessions to the Netherlands over an agreement between the European Union and Ukraine that was rejected by Dutch voters in a referendum. Arriving at her first European Union summit meeting, Britain's prime minister, Theresa May, sought to sound constructive, telling reporters that Britain would "continue to play a full role until we leave." She later made it clear that she expected to be included in the bloc's decision-making and meetings until then.