Russia, the US and Jordan have agreed to a ceasefire in part of Syria.
It will begin on Sunday and cover the south-west of the country.
The deal was struck at the G20 summit in Hamburg.
Meanwhile Russian President Vladimir Putin says Russia did not meddle in last year's US election.
The denial came during his first ever face-face meeting with US President Donald Trump.
The men discussed a range of issues during two hours of talks, and shared a handshake.
President Donald Trump has been complimenting President Putin, just a day after he criticised him for supporting Iran and Syria.
"President Putin and I have been discussing various things, and I think it's going very well.
"We've had some very, very good talks - we're going to have a talk now and obviously that will continue.
"But we look forward to a lot of very positive things happening", President Trump said.
Mr Putin said: "Your excellency, Mr President, we spoke over the phone with you several times on very important bilateral and international issues.
"I'm delighted to be able to meet you personally, Mr President, and I hope as you have said our meeting will yield positive results".
The summit has seen widespread protests in the north German city.
Police officers are silhouetted by fires lit by demonstrators during a protest against the G-20 summit in Hamburg. Picture by: Markus Schreiber/AP/Press Association Images
Riot police fired water cannon and tear gas at protesters who hurled bottles and bricks on Thursday.
At least 76 police officers were injured in clashes with demonstrators as world leaders were arriving for the talks.
The demonstration was dubbed 'Welcome to Hell' by anti-capitalist groups.
Police said the trouble involved around 1,000 people, but as many as 100,000 were expected to descend on the city to take part in protests during the two-day summit
Earlier, police said water cannons were used after demonstrators refused to move:
Schröderstiftstraße wird die Straße blockiert. Trotz mehrfacher Aufforderung entfernen sich die Gruppen nicht. Wasserwerfereinsatz #G20HAM17
— Polizei Hamburg (@PolizeiHamburg) July 7, 2017
Up to 20,000 police are on hand for the Hamburg summit given the history of violent protests at previous gatherings.
The G20 countries - whose members represent about 80% of the world's population - are meeting with their usual broad remit of making the world a more stable and prosperous place.
Climate change is set to be a major talking point after President Trump withdrew the US from the landmark Paris Agreement.
