US President Donald Trump is to meet his Russian counterpart, Vladimir Putin, for the first time at a G20 summit in Hamburg, Germany.
They have both said they want to repair ties damaged by the crises in Syria and Ukraine, as well as Russia’s alleged meddling in the US election.
Climate change and international trade are set to dominate the summit, which is drawing mass protests.
Clashes at a “Welcome to Hell” rally left 76 police officers injured.
By choosing to hold the summit in Hamburg, Germany’s northern hi-tech powerhouse, Chancellor Angela Merkel is seeking to show mass protests can be tolerated in an open democracy, correspondents say.
On Thursday, Trump won praise from at least one Republican hawk in the U.S. Congress after his speech in Warsaw in which he urged Russia to stop its “destabilizing activities” and end its support for Syria and Iran.
The US president called on Russia to “join the community of responsible nations in our fight against common enemies and in defence of civilization itself.”
But – without directly blaming Russia – he also warned that western interests were being tested by “propaganda, financial crimes and cyber warfare.”