A day after meeting with British Prime Minister Theresa May, French President, Emmanuel Macron and German Chancellor Angela Merkel met at Paris’ Élysée Palace for a critical private meeting about the future of the European Union.

Merkel travelled to Paris to meet Macron for talks on the 55th anniversary of the signing of the Élysée Treaty – a landmark friendship agreement between the historic rival signed by then-French President Charles de Gaulle and Konrad Adenauer, chancellor of West Germa...