Russia is considering whether to follow the US and its allies in conducting air strikes against Islamic State (IS) targets, President Vladimir Putin says.
Mr Putin spoke after meeting Barack Obama on the sidelines of the UN General Assembly (UNGA).
But the meeting, and the leaders’ speeches at the UNGA, also highlighted splits about how to end the Syrian war.
Russia said it would be an “enormous mistake” not to work with Syria’s President Bashar al-Assad to tackle IS.
On Monday, the US and France again insisted that President Assad must go. But in response, Mr Putin said: “They aren’t citizens of Syria and so should not be involved in choosing the leadership of another country.”
Russia would conduct air strikes only if they were approved by the United Nations, he said, while also ruling out Russian troops taking part in a ground operation in Syria.
The two leaders met for 90 minutes on the sidelines of the UNGA in talks that Mr Putin called “very constructive, business-like and frank”.
It was their first face-to-face meeting in almost a year, with the Ukraine war also on the agenda.
A senior US government official said neither president was “seeking to score points” in the talks. Both sides agreed to open lines of communication to avoid accidental military conflict in the region, the official added.
Pro-Kremlin media are portraying Putin’s speech and meeting with President Obama as a victory for Russia.
“Vladimir Putin addressed the world” is Komsomolskaya Pravda’s headline, reflecting the Kremlin’s attempt to reassert Russia’s role on the world stage.
On Russian TV, a pro-Kremlin MP has claimed that the timing of Nasa’s announcement about water on Mars was designed by Washington to trump the Putin speech.
As for business daily Vedomosti, it notes that the Kremlin’s call for a coalition against Islamic State may be “part of a political strategy to remove sanctions” against Russia. It’s unclear whether it’ll work.
After his meeting with Obama, Mr Putin admitted US-Russian relations had fallen to a very low level and he left no doubt who was to blame: America.
In his speech to the UNGA, Mr Obama said compromise among powers would be essential to ending the Syrian conflict, which has claimed more than 200,000 lives and forced four million people to flee abroad.
“The US is prepared to work with any nation, including Russia and Iran, to resolve the conflict,” he said.
“But we must recognise that there cannot be, after so much bloodshed, so much carnage, a return to the pre-war status quo.”
But Mr Putin said it was an “enormous mistake to refuse to co-operate with the Syrian government and its armed forces who are valiantly fighting terrorism face-to-face”.
He also called for the creation of a “broad anti-terror coalition” to fight IS, comparing it to the international forces that fought against Nazi Germany in World War Two.