Syria

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FILE - In this photo provided on Tuesday, Jan. 24, 2017, by the Russian Defense Ministry Press Service, shows an Islamic State group base targeted by a Russian air strike , around Deir el-Zour in eastern Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (Russian Defense Ministry Press Service Photo via AP, File)

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FILE - This April 30, 2017 file photo, provided by the Syrian Democratic Forces (SDF), shows fighters from the SDF looking toward the northern town of Tabqa, Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (Syrian Democratic Forces, via AP, File)

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FILE - This March 7, 2017 file frame grab from video provided by Arab 24 network, shows U.S. forces patrolling on the outskirts of the Syrian town of Manbij, in Aleppo province, Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (Arab 24 network, via AP, File)

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FILE - In this file picture released by the Iranian state-run IRIB News Agency on Monday, June 19, 2017, a missile is fired from city of Kermanshah in western Iran targeting the Islamic State group in Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (IRIB News Agency, Morteza Fakhrinejad via AP, File)

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FILE -- In this file photo provided on Monday, Jan. 23, 2017 by the Russian Defense Ministry Press Service shows Russian air force Tu-22M3 bombers strike the Islamic State targets the IS around Deir el-Zour, eastern Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria.(Russian Defense Ministry Press Service via AP, File)

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FILE - In this file photo taken on Wednesday, Feb. 17, 2016, a volunteer fighter with the Syrian Government forces sits atop a tank in the province of Raqqa, Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (Alexander Kots/Komsomolskaya Pravda via AP, File)

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FILE - In this file photo taken on Wednesday, Feb. 17, 2016, soldiers from the Syrian army carry a rocket to fire at Islamic State group positions in the province of Raqqa, Syria. Syrian government and allied troops have inserted themselves into the battle against Islamic State militants by capturing key areas on the flanks of the coalition-led battle to seize Raqqa. They have positioned themselves as indispensable possibly spoilers in the fight to uproot the militants from Syria. (Alexander Kots/Komsomolskaya Pravda via AP, File)

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This image provided by the Syrian Arab Red Crescent shows the aftermath of an attack on a humanitarian aid convoy that came under fire shortly before dark Saturday, June 17, 2017, outside Damascus, Syria. The International Committee of the Red Cross says the humanitarian aid convoy to a besieged opposition area outside Syria’s capital has come under attack, wounding a driver and thwarting the first such mission to the area in eight months. (Syrian Arab Red Crescent via AP)

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This image provided by the Syrian Arab Red Crescent shows the aftermath of an attack on a humanitarian aid convoy that came under fire shortly before dark Saturday, June 17, 2017, outside Damascus, Syria. The International Committee of the Red Cross says the humanitarian aid convoy to a besieged opposition area outside Syria’s capital has come under attack, wounding a driver and thwarting the first such mission to the area in eight months. (Syrian Arab Red Crescent via AP)

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This image provided by the Syrian Arab Red Crescent shows the aftermath of an attack on a humanitarian aid convoy that came under fire shortly before dark Saturday, June 17, 2017, outside Damascus, Syria. The International Committee of the Red Cross says the humanitarian aid convoy to a besieged opposition area outside Syria’s capital has come under attack, wounding a driver and thwarting the first such mission to the area in eight months. (Syrian Arab Red Crescent via AP)

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This photo taken from the Russian Defense Ministry official web site on Friday, June 16, 2017, claims to show an aerial image at left of the IS headquarters on May 13, 2017, and an aerial image taken on May 29, at right, showing the same site following the Russian airstrike on May 28, 2017 on the outskirts of Raqqa, Syria. The sign at right reads Airstrike, the target destroyed. The sign on bottom right says The date of airstrike is May 28, 2017. Russia says it is verifying whether it killed the leader of the Islamic State group in an airstrike targeting a meeting of IS leaders just outside the group's de facto capital in Syria. (Russian Defense Ministry Press Service Photo via AP)

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This photo provided by the Syrian Civil Defense group known as the White Helmets, shows civilians rushing out of the damaged buildings after airstrikes hit a school housing a number of displaced people, in the western part of the southern Daraa province of Syria, Wednesday, June 14, 2017. A U.N. investigative commission said Wednesday the "de-escalation" agreement in Syria has reduced violence in only one of four zones included in the deal and has not led to greater humanitarian access. (Syrian Civil Defense White Helmets via AP)

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This photo provided by the Syrian Civil Defense group known as the White Helmets, shows civil defense workers carrying children after airstrikes hit a school housing a number of displaced people, in the western part of the southern Daraa province of Syria, Wednesday, June 14, 2017. A U.N. investigative commission said Wednesday the "de-escalation" agreement in Syria has reduced violence in only one of four zones included in the deal and has not led to greater humanitarian access. (Syrian Civil Defense White Helmets via AP)

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This photo provided by the Syrian Civil Defense group known as the White Helmets, shows a civil defense worker carrying a child after airstrikes hit a school housing a number of displaced people, in the western part of the southern Daraa province of Syria, Wednesday, June 14, 2017. A U.N. investigative commission said Wednesday that the "de-escalation" agreement in Syria has reduced violence in only one of four zones included in the deal and has not led to greater humanitarian access. (Syrian Civil Defense White Helmets via AP)

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FILE - In this file picture taken Friday, Jan. 20, 2017 from the balcony of the Abdul-Hamid Khatib home, people walk through mounds of rubble which used to be high rise apartment buildings in the once rebel-held Ansari neighborhood in the eastern Aleppo, Syria.(AP Photo/Hassan Ammar, File)