Terrorism and geopolitics will color discussions usually centered on economies and trade.
The former Republican presidential hopeful criticized the Obama administration's measured approach to fighting the Islamic State group.
Previous suicide bombers in Europe mostly stored their explosives in backpacks, according to intelligence experts.
The attacks in Paris underscored the growing capabilities of ISIS, putting new pressure on Moscow and Washington to come together and find a solution in Syria.
Following Friday's carnage in Paris, French and American leaders said they would redouble attacks targeting Islamic State strongholds.
“In France there was never a real moment of realization about the problem,” Christian Harbulot, a French intelligence and defense expert, told International Business Times Sunday.
French police issued an arrest warrant Sunday for Salah Abdeslam, a 26-year-old Belgian-born man who was allegedly directly involved in the deadly terrorist attacks in Paris Friday.
This map from IBT gives detailed information on which countries are fighting ISIS as the threat of terrorism moves beyond Syria and Iraq.
The kingdom appears more likely than ever to come to the negotiating table and work for a permanent solution in Syria, some experts say.
The two leaders huddled together before the opening session of the Group of 20 summit in the Turkish city of Antalya.
U.S. public opinion already is divided on Syrian refugees, but the Paris attacks are heightening fears about accepting them into the country.
Washington already expects France to retaliate by taking on a larger role in the U.S.-led coalition’s bombing campaign against Islamic State.
GOP presidential candidates strongly criticized President Barack Obama's foreign policy, calling Saturday for the U.S. to take a stronger stance against ISIS.
French President Francois Hollande and U.S. Secretary of State John Kerry use "Daesh" to refer to the Islamic State -- some argue that everyone else should.
Authorities said Ismaël Omar Mostefai and Abbdulakbak B. were among eight assailants who launched Friday's rampage.
The Western military alliance could invoke Article 5, which declares an attack against one ally to be an attack against all, security experts said.
A discussion is set for the meeting on Sunday to talk about the Paris terror attacks.
Lebanese authorities arrested five Syrians and one Palestinian in the twin suicide bombings that killed 43 in Beirut's Burj al-Barajneh district Thursday.
Across the world, prominent Muslim leaders criticized the Islamic State group's deadly attacks in Paris, calling for international cooperation in the fight against terrorism.
The terrorists had ties to Egypt and Syria, as well as Belgium and France, according to a prosecutor in Paris.
Recent shifts in France’s political atmosphere, as well as its presence in conflicts abroad, offer clues as to what has made it such an attractive target for terrorists.
After the attacks in Paris, many Muslims wondered how to counter entrenched perceptions that Islam condones terrorism.
