A minivan drives past a portrait of Syrian President Bashar Assad in Damascus last week. U.S. forces fired a barrage of cruise missiles at a Syrian air base Thursday in response to what President Trump called a "barbaric" chemical attack he blamed on the Assad regime. Louai Beshara/AFP/Getty Images hide caption

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Louai Beshara/AFP/Getty Images

A picture taken Friday shows the damaged Shayrat airfield at the Syrian military base targeted overnight by U.S. Tomahawk cruise missiles, southeast of the central Syrian city of Homs. AFP/Getty Images hide caption

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AFP/Getty Images

Sen. John McCain, R-Ariz., speaks during the Munich Security Conference last week. McCain's office has confirmed that while he was overseas, he met with U.S. forces in Syria about defeating ISIS. Matthias Schrader/AP hide caption

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Matthias Schrader/AP

Syrian rebel fighters and civilians are evacuated from pockets of eastern Aleppo on Wednesday. George Ourfalian/AFP/Getty Images hide caption

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George Ourfalian/AFP/Getty Images

People flee rebel-held eastern neighborhoods of Aleppo into the Sheikh Maqsud area, controlled by Kurdish fighters, in Syria on Sunday. The photo was provided by the Rumaf, a Syrian Kurdish activist group, and authenticated by The Associated Press. The Rumaf/AP hide caption

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The Rumaf/AP

A Syrian man, flanked by his son and his nephews, lays a myrtle branch on the grave of his brother at a cemetery in the rebel-held town of Douma, east of the capital Damascus, on Monday, on the first day of the Muslim holiday of Eid al-Adha. Sameer al-Doumy/AFP/Getty Images hide caption

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Sameer al-Doumy/AFP/Getty Images

Amnesty International interviewed former Saydnaya detainees and then used architectural and acoustic modeling to reconstruct the architecture of the prison. The interview techniques were developed by Forensic Architecture at Goldsmiths, University of London, in consultation with the university's Forensic Psychology Unit. Courtesy of Amnesty International/Forensic Architecture hide caption

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Courtesy of Amnesty International/Forensic Architecture

Syrian President Bashar Assad addresses parliament in Damascus on Tuesday, saying he will retake "every inch" of Syrian territory. Assad's defiant tone comes at a time when peace efforts for the country have been crumbling. SANA via AP hide caption

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SANA via AP

Bashar Assad's Defiance Points To A Syrian Peace Effort In Tatters

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Syria's regime and opposition groups have agreed on a "cessation of hostilities." Here, a Syrian flag waves as vehicles move during rush hour in Damascus on Sunday. Hassan Ammar/AP hide caption

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Hassan Ammar/AP

Syrian President Bashar Assad speaks during a Dec. 11 interview in Damascus with the Spanish news agency EFE. In his latest interview, he blames foreign powers and "terrorists" for the country's civil war and says he still hopes to put the country back together. SANA via AP hide caption

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SANA via AP

Damaged vehicles are seen at the site of a double car bomb attack in the Zahraa neighborhood of Homs in central Syria. The city is almost completely controlled by the Syrian government, and has regularly been targeted by attacks. AFP/Getty Images hide caption

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AFP/Getty Images