Members of the Syrian band Khebez Dawle include (from left to right) Hekmat Qassar on guitar and keyboards, lead guitarist Bashar Darwish, bassist Muhammad Bazz and lead singer Anas Maghrebi. Half the band members are now in Turkey, and are strongly considering seeking asylum in Europe. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

Lucie Morillon, head of research at French watchdog of Reporters Sans Frontieres (Reporters without Borders) holds a banner depicting Syrian human rights activist Mazen Darwish during a protest against violence in Syria, in Paris, Saturday, Oct. 20, 2012. Darwish was released from a Syrian prison Monday. Francois Mori/AP hide caption

itoggle caption Francois Mori/AP

Kurdish rebels in northern Syria walk near the devastated town of Kobani last November. The U.S. bombing campaign helped the Kurds push back the Islamic State from the area. But overall, the U.S. operation against ISIS in Iraq and Syria has shown only limited gains in the past year. Jake Simkin/AP hide caption

itoggle caption Jake Simkin/AP

A fighter with Jabhat al-Nusra, the al-Qaida affiliate in Syria, takes down a picture of Syria's President Bashar Assad in the northwestern city of Ariha in May. Jabhat al-Nusra is strong in this area, and recently captured Syrian fighters trained by the U.S. Ammar Abdullah/Reuters/Landov hide caption

itoggle caption Ammar Abdullah/Reuters/Landov

Flags of member nations wave outside NATO headquarters in Brussels. For just the fifth time in its 66-year history, NATO ambassadors met in an emergency, Article 4 session to gauge the threat that the so-called Islamic State poses to Turkey. Geert Vanden Wijngaert/AP hide caption

itoggle caption Geert Vanden Wijngaert/AP

Syrian President Bashar Assad speaks during his meeting with the heads and members of public organizations and professional associations in Damascus, on Sunday. Assad acknowledged that the fight against rebels had suffered setbacks, but vowed to win against insurgents. SANA/Reuters/Landov hide caption

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Civil defense workers wear gas masks near damaged ground in a village near the Syrian city of Idlib in May. Activists said there had been a chlorine attack. Abed Kontar/Reuters/Landov hide caption

itoggle caption Abed Kontar/Reuters/Landov

A U.S. Air Force plane takes off as a Turkish air force fighter jet taxis at the Incirlik airbase, southern Turkey, in 2013. Reversing an earlier policy, Ankara has agreed to allow the U.S.-led coalition to fly anti-ISIS airstrikes from the base. Vadim Ghirda/AP hide caption

itoggle caption Vadim Ghirda/AP

"What we are doing now has nothing to do with what we expected to be doing," says Rami Jarrah, who protested against the Assad regime in Damascus in 2011 and now runs a radio station from southern Turkey that broadcasts to civilians in rebel-controlled territory in northern Syria. Alison Meuse/NPR hide caption

itoggle caption Alison Meuse/NPR

Saeed al-Batal, a Syrian photographer, posted this image from Douma, Syria, on his Facebook page on March 31. Courtesy of Saeed al-Batal hide caption

itoggle caption Courtesy of Saeed al-Batal

Malala Yousafzai celebrated her birthday and the opening of a new school with "brave and inspiring girls of Syria" in Lebanon on Sunday. WAEL HAMZEH/EPA /LANDOV hide caption

itoggle caption WAEL HAMZEH/EPA /LANDOV

Refugees from Syria arrive in Presevo, near the border with Macedonia, in the south of Serbia, on Wednesday. The U.N. says more than 4 million have fled the civil war in Syria, making it the worst refugee crisis in a quarter century. Djordje Savic/EPA/Landov hide caption

itoggle caption Djordje Savic/EPA/Landov

Syrian Kurds from Kobani wait behind the border fences to cross into Turkey on Friday. An attack by Islamic State fighters on the Syrian town of Kobani and a nearby village has so far killed at least 146 civilians, the second-biggest massacre by the hardline group in the country, a conflict monitor said on Friday. Murad Sezer/Reuters/Landov hide caption

itoggle caption Murad Sezer/Reuters/Landov