An anti-government media group, shows civilians leaving the town of Suran, in Hama province, Syria. Five years of failed efforts to quell the fighting in Syria have persuaded many observers that the war, inconclusive and catastrophic on a historic scale, may be unresolvable. But a closer look at the landscape allows a glimmer of hope that a turning point may have been reached with the truce that took effect Monday.

Syria Press Center via AP

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An anti-government media group, shows civilians leaving the town of Suran, in Hama province, Syria. Five years of failed efforts to quell the fighting in Syria have persuaded many observers that the war, inconclusive and catastrophic on a historic scale, may be unresolvable. But a closer look at the landscape allows a glimmer of hope that a turning point may have been reached with the truce that took effect Monday.

Syria Press Center via AP

BEIRUT – Syria’s military began withdrawing from a major artery to Aleppo late Thursday as the U.N. envoy accused President Bashar Assad’s government of obstructing aid access to the contested city.

A monitoring group reported three civilian fatalities, the first since the U.S.-Russian-brokered cease-fire took effect three days ago.

Meanwhile, Russia was expected to deploy its forces along Aleppo’s Castello Road to ensure safe passage for humanitarian convoys to the city’s opposition-held quarters. It would be the most overt participation by Russian ground forces in the Syrian war, underscoring Moscow’s position as power broker in the conflict. Russia intervened with its air force on the side of the Assad government last year, turning the tide of the war in his favor.

As part of the truce deal, the rebels and the Syrian government are supposed to agree to the deployment of a security force to protect checkpoints along the route to Aleppo to ensure aid delivery to the city’s opposition sector, which has been besieged by Russian-backed government forces since July. The U.N. estimates about a quarter million people are trapped inside.

However, the U.N. envoy to Syria, Staffan de Mistura, said despite the dramatic drop in violence since the cease-fire took effect on Monday, the humanitarian aid flow that was supposed to follow had not materialized.

Speaking in Geneva, de Mistura blamed Assad’s government for the delay.

He said the Syrian government had not provided the necessary “facilitation letters,” or permits, to allow the aid convoys to reach opposition areas, disappointing even Russia, the Syrian president’s key backer.

De Mistura said 40 aid trucks were ready to move and the U.N. would prioritize delivery to the embattled rebel-held eastern neighborhoods of Aleppo.

“That is what makes a difference for the people, apart from seeing no more bombs or mortar shelling taking place,” he said of the aid deliveries that are supposed to be part of the truce deal.

“It is particularly regrettable. ... These are days which we should have used for convoys to move ... because there is no fighting,” he said.