REPUBLIKA.CO.ID, GENEVA -- Russia said on Thursday it would support a 48-hour ceasefire in Aleppo, a move the U.N. Syria envoy said would allow aid to reach besieged areas soon, as long as all sides respect the temporary truce.

As pictures of a dazed child pulled from the rubble in heavily bombarded rebel-held eastern Aleppo captured the plight of the city's civilians, Moscow said it was ready to start the first humanitarian pause next week. Western diplomats gave cautious welcome to the announcement, while raising questions about Moscow's motives and stressing the United Nations must be in charge of a sustained aid operation.

UN Special Envoy Staffan de Mistura has long called for a 48-hour halt in fighting each week to allow aid delivery and medical evacuations from both rebel-held eastern and government-controlled western Aleppo. He welcomed the Russian defence ministry announcement and said the U.N. humanitarian team is now set to mobilize itself to respond to this challenge.

"Our plan is to collectively work out the operational details, and be ready for delivery as soon as possible," de Mistura's office said in a statement.

Moscow must ensure its allied Syrian government forces adhere to the pause, while the United States and regional powers must ensure opposition fighters are also on board, he said. "The challenge will be in operational arrangements and making sure there is a real pause in fighting and that it (Russia) is not using this for its own strategic advantage and gathering forces for another offensive," one Western diplomat told Reuters.

"It's no surprise this has come at a time when the rebels have managed to break through the besiegement of Aleppo and establish their own corridor."

Aleppo, Syria's most populous pre-war city and its commercial hub, has become the focus of fighting in the five-year-old civil war. Up to 2 million people on both sides lack clean water after infrastructure was damaged in bombing. "Trucks with food, water and medicine are ready to move immediately and ambulances to evacuate urgent medical cases are on standby," said Jens Laerke, spokesman for the U.N. Office for the Coordination of Humanitarian Affairs.

Another Western diplomat said it was important for the United Nations to lead the aid effort. "It is not a Russian operation, it has to be a U.N. operation to be a good and credible operation," he told Reuters.

"It would start at the beginning of next week on condition that there is an agreement between the UN, Russia and the (Syrian) regime on modalities."

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