Donald Trump and Vladimir Putin have met for the first time, shaking hands and holding face-to-face talks as the G20 summit in Hamburg began.
Donald Trump and Vladimir Putin have discussed the alleged Russian hacking of last year’s US presidential election during their first meeting.
US Secretary of State Rex Tillerson described the exchanges as “robust”.
Russian Foreign Minister Sergei Lavrov said Mr Trump had accepted Mr Putin’s assertions that his country was not responsible.
But Mr Tillerson said it was not clear whether the two countries would ever come to an agreement on what happened.
“I think the president is rightly focused on how do we move forward from something that may be an intractable disagreement at this point,” he added.
The US and Russian presidents held their first face-to-face talks on the sidelines of the G20 summit in the German city of Hamburg, which is being held amid sometimes violent protests.
Other topics discussed during their meeting – which lasted nearly two-and-a-quarter hours, longer than originally planned – included the war in Syria, terrorism and cybersecurity.
“It’s an honour to be with you,” said Mr Trump to Mr Putin, who responded: “I’m delighted to meet you.”
The US and Russian leaders say they want to repair ties damaged by crises including Russia’s alleged meddling in the US election.
Climate change and trade are set to dominate the two-day G20 meeting.
Violent clashes between protesters and police are taking place in the streets outside the venue, with dozens left injured.
US First Lady Melania Trump has been unable to leave her hotel in the German city because of the protests.
A huge police operation is trying to keep demonstrators – who are protesting against the presence of Mr Trump and Mr Putin, climate change and global wealth inequalities – well away from the summit venue, and water cannon have been deployed.
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Media captionTrump and Putin shake hands – filmed by the German government
The G20 (Group of Twenty) is a summit for 19 countries, both developed and developing, plus the EU.
In her summit opening statement, German Chancellor Angela Merkel said: “We are all aware of the great global challenges.
“We know that time is short and therefore solutions very often can only be found if we are ready to compromise and work together without bending over backwards too much because, of course, we can express different views on some issues.”
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Mrs Trump had been due to take part in an excursion with other leaders’ spouses, but her spokeswoman Stephanie Grisham said: “The Hamburg police could not give us clearance to leave.”
Mrs Trump herself tweeted concern for those injured in the protests.
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A brief video clip posted on the German government’s Facebook page shows the two men shaking hands, and Mr Trump patting Mr Putin’s arm as they smile in the company of other leaders.