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Beirut • A diplomatic push for a temporary pause in Syria's civil war and the delivery of humanitarian aid faced huge hurdles Friday, with Russia saying it would continue its airstrikes and government planes dropping leaflets urging rebels to surrender because "the belt is narrowing around you."

A plan for the "cessation in violence" announced by the U.S. and Russia does not go into effect for a week, and while the Syrian opposition expressed "cautious optimism," it also said more innocent civilians would be killed in that span.

Government forces, aided by a withering Russian bombing campaign, are trying to encircle rebels in Syria's largest city of Aleppo and cut off their supply route to Turkey. Another week of fighting could bring the Syrian troops closer to that goal.

Syrian forces recaptured several strategic hills north of Aleppo and are in position to target the final supply line to the rebel-held eastern suburbs, according to Al-Manar TV, a Lebanese channel run by the militant group and Syrian ally Hezbollah.

Heavy fighting between government and opposition forces occurred south of Aleppo, around the town of Tamoura, according to the Britain-based Syrian Observatory for Human Rights. It said 12 fighters of the al-Qaida-linked Nusra Front were killed.

U.S. Secretary of State John Kerry praised the agreement in Munich as a significant accomplishment in the five-year war, but he noted that a cessation of hostilities, if achieved, would only be a "pause" in the fighting and that more work would be needed to turn it into a full-fledged cease-fire.

He also said the agreements made were "commitments on paper" only. "The real test is whether or not all the parties honor those commitments and implement them," he told reporters after the nearly six-hour meeting concluded early Friday.

Kerry and Russian Foreign Minister Sergey Lavrov said a task force must try to deal with the "modalities" of the temporary truce. The task force will include members of the military along with representatives from countries that are supporting various armed groups in Syria. The Syrian government and the opposition would both have to agree to the details.