Leaders of France and Germany meet on Tuesday to deepen a 1963 treaty of post-war reconciliation in a bid to show that the European Union’s main axis remains strong and counter growing Eurosceptic nationalism among some other members.

German Chancellor Angela Merkel and French President Emmanuel Macron will sign the extension to the Elysee Treaty in the German border city of Aachen, an historical symbol of European concord, before holding a discussion with citizens.

“We want to give an impulse to European unity,” Merkel said in her weekly podcast on Saturday.