WASHINGTON — The global anxiety sparked by a series of deadly attacks in Paris by the Islamic State group has given new urgency to President Barack Obama’s upcoming talks with world leaders.

The crisis in Syria, where the Islamic State group has taken root, was already high on the agenda at the meeting of 20 leading industrialized and emerging-market nations. But the violence in Paris that killed at least 129 people will dramatically change the dynamic of the talks in Antalya, Turkey, a seaside resort city just a few hundred miles from the Syrian border.

In remarks from the White House shortly after the attacks, Obama said, “We’re going to do whatever it takes to work with the French people and with nations around the world to bring these terrorists to justice, and to go after any terrorist networks that go after our people.”

French President Francois Hollande said Islamic State militants were behind the attacks and the extremist group claimed responsibility Saturday. The U.S. has not yet said whether it believes the group is responsible for the carnage, but a senior U.S. intelligence official said the U.S. has no information that contradicts President Francois Hollande’s assessment” that the Islamic State was responsible. The official was not authorized to speak publicly and requested anonymity.

Obama met with his national security team at the White House on Saturday before departing for Turkey. His trip includes stops in the Philippines and Malaysia for a pair of Asia-Pacific summits.

The president is supposed to travel to Paris in two weeks for a high-stakes climate conference, though there’s now some doubt whether that meeting can take place in the French capital, given that securing the leaders could come at the expense of other pressing security matters.

Security is expected be extremely tight in Turkey as leaders gather for two days of talks in Antalya, where several suspected Islamic State militants were recently detained.

The president’s first meeting in Turkey is with Turkish President Recep Tayyip Erdogan, whose ties with the White House have become increasingly strained. Their meeting wasn’t announced until shortly before Obama’s departure, underscoring the “very tense nature” of the U.S.-Turkey relationship, according to Heather Conley, a Europe expert at the Center for Strategic and International Studies, a Washington think tank.

While Erdogan shares Obama’s desire to get Syrian President Bashar Assad out of power in Syria, the two leaders have disagreed over tactics.

“The U.S. and Turkey do not align on the dimension of the Syrian campaign,” Conley said.

Erdogan has been frustrated by Obama’s willingness to use military force against the Islamic State, but not against Assad. The U.S., meanwhile, was irked by Erdogan’s reluctance to join the campaign against Islamic State , though Turkey eventually decided to start bombing the militants this summer and also allowed the U.S. to launch its own airstrikes from key bases in the county.

Obama’s dealings with Russian President Vladimir Putin over Syria have been even more complicated. As Assad’s biggest benefactor, Russia has essentially propped up the Syrian leader throughout the crisis. Until Putin is willing to abandon Assad and accept new leadership in Syria, it’s unlikely a political solution can be reached.

Despite Obama’s vow to isolate Putin in retaliation for Russian aggression in Ukraine, the president agreed to meet with his longtime foe in New York earlier this year to discuss Syria. The slight optimism U. S. officials expressed after the meeting was quickly dashed when Russia began launching its own airstrikes in Syria, raising the prospect of a proxy war with the U.S.

While Putin says his country’s forces are targeting the Islamic State, U.S. officials have accused Russia of instead going after forces fighting Assad in a bid to protect the Syrian leader.

Obama and Putin won’t hold another formal meeting in Turkey, but White House officials said they would have plenty of time to talk on the sidelines of the G-20.

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