A British Union flag, also known as a Union Jack, left, and flags of the European Union (EU) hang from flagpoles outside the European Commission building during a meeting of European Union (EU) leaders in Brussels, Belgium, on Friday, Oct. 21, 2016. The divisions between the U.K. and the rest of the European Union began to take shape on Thursday as Germany warned Britain faces a difficult path at Theresa Mays first summit as prime minister. Photographer: Jasper Juinen/Bloomberg via Getty Images