World leaders have promised to tighten border controls, step up intelligence sharing and crack down on terrorist financing at a summit in Turkey - but there was little sign of a dramatic shift in strategy against Islamic State in Syria.
The G20 summit in Turkey's coastal province of Antalya has been dominated by Friday's suicide bombings and shootings in Paris, which killed at least 129 people and underlined the threat posed by the radical jihadist group far beyond its strongholds in Syria and Iraq.
"The horrific attacks in Paris on Friday night, so soon after the Russian airline disaster and following on from the Ankara bombings and the attacks in Tunisia and Lebanon, they underline the threat we all face," British Prime Minister David Cameron told a news conference on Monday.
"We have agreed to take further important steps to cut off the financing that terrorists rely on, to counter the extremist ideology of the terrorist propaganda and to better protect ourselves from the threat of foreign fighters by sharing intelligence and stopping them from travelling."
French warplanes pounded positions held by Islamic State in Syria on Sunday.
Foreign Minister Laurent Fabius described it as an act of self-defence following the Paris attacks.
"France has always said that given the manner in which it has been threatened, not only threatened but attacked, by Daesh (IS), it is completely normal that it takes the initiative and as an act of legitimate defence, takes action," he told reporters.
US President Barack Obama vowed on Sunday to step up efforts to eliminate Islamic State and prevent more attacks like those in the French capital, while urging his Russian counterpart, Vladimir Putin, in an informal meeting to focus his military campaign in Syria on combating the jihadist group.
Kremlin spokesman Dmitry Peskov said on Monday the meeting with Obama had been constructive but not groundbreaking.
Cameron, who also held a one-hour meeting with the Russian leader, said differences in opinion over Assad's future had been enormous but appeared to be narrowing.
"There are big differences, we don't hide those, we discuss them. But it is important in all these instances to have a proper dialogue with people like him," Cameron said.
US officials said Washington wanted to intensify existing efforts against Islamic State, including the bombing campaign and arming Syrian rebels.
Obama will meet with European allies at the end of the summit to try to shore up their common front.
But the officials said there were no immediate plans for any dramatic shift in strategy such as the deployment of significant ground forces.
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