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Hopes for a ceasefire taking hold this week in Syria dimmed Sunday as Turkey renewed its shelling of Kurdish militants and Washington demanded Moscow end air strikes on rebels. Tensions over Syria have continued to mount despite the proposal from international powers in Munich on Friday for a "cessation of hostilities" within a week. Defying US and French calls, Turkey on Sunday carried out a second day of shelling on a Kurdish-Arab alliance advancing in northern Aleppo province, prompting condemnation from Syria's government.
By Tom Perry and Jeff Mason BEIRUT/WASHINGTON (Reuters) - U.S. President Barack Obama urged Russia on Sunday to stop bombing "moderate" rebels in Syria in support of its ally Bashar al-Assad, a campaign seen in the West as a major obstacle to latest efforts to end the war. Major powers agreed on Friday to a limited cessation of hostilities in Syria but the deal does not take effect until the end of this week and was not signed by any warring parties - the Damascus government and numerous rebel factions fighting it. Russian bombing raids directed at rebel groups are meanwhile helping the Syrian army to achieve what could be its biggest victory of the war in the battle for Aleppo, the country's largest city and commercial hub before the conflict.