"All for one and one for all" - the famous motto of the Musketeers was supposed to apply to the 28 countries that make up the European Union too. But in recent months some major cracks have been opening up between East and West: with Hungary and Slovakia losing a legal bid to ignore EU migrant quotas; and French President Emmanuel Macron vowing to tackle abuse of the "posted workers" scheme, to cite just two examples. Some commentators are even referring to a "new iron curtain".
On this edition of Talking Europe, we're peering into some of these cracks between Eastern and Western Europe, and asking whether they can be glued back together again.
A programme presented by Catherine Nicholson
Produced by Isabelle Romero and Laura Burloux
French MEP, Alliance of Liberals and Democrats
Polish MEP, Non-attached members