German Chancellor Angela Merkel and French President Emmanuel Macron were due to meet in Berlin Sunday in a show of unity against rising populism in the era of US President Donald Trump.
At their second meeting in a week, the two are expected to once again raise the idea of establishing a European army as a symbol of a united continent, a proposal that has raised Trump's hackles.
Macron's visit comes a week after world leaders met in Paris to commemorate the end of World War I a century ago and marks Germany's Day of Mourning for victims of war and dictatorship.
After a wreath-laying ceremony, Macron was at 1230 GMT to address the German parliament -- housed in the glass-domed Reichstag still bearing the scars of World War II -- in the first speech by a French leader to the assembly in 18 years.
Macron and Merkel, who were to meet for talks from 1400 GMT, are both committed pro-Europeans who have resisted rising populist, eurosceptic, and anti-immigration forces in Europe, as well as Trump's isolationist "America First" stance.
As the world has remembered World War I, which ended a century ago this month, Macron has repeatedly invoked its horrors to drive home the message that rising nationalism is again destabilising the world.
Macron and Merkel have proposed a European army that would operate within NATO -- an idea Trump has mocked by tweeting that "it was Germany in World Wars One & Two - How did that work out for France?"