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TOPSHOT - People walk amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016.
The death toll from an upsurge of fighting in Syria's second city Aleppo rose despite a plea by the UN envoy for the warring sides to respect a February ceasefire. / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)
TOPSHOT - People walk amid the rubble of destroyed buildings following a reported air strike on the rebel-held neighbourhood of al-Kalasa in the northern Syrian city of Aleppo, on April 28, 2016.
The death toll from an upsurge of fighting in Syria's second city Aleppo rose despite a plea by the UN envoy for the warring sides to respect a February ceasefire. / AFP / AMEER ALHALBI        (Photo credit should read AMEER ALHALBI/AFP/Getty Images)

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    The struggle to maintain the Syrian ceasefire

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The struggle to maintain the Syrian ceasefire

CNN's Frederick Pleitgen is embedded with Russian troops in northwestern Syria as they struggle to maintain peace in parts of Syria.

The struggle to maintain the Syrian ceasefire

CNN's Frederick Pleitgen is embedded with Russian troops in northwestern Syria as they struggle to maintain peace in parts of Syria.