GENEVA (AP) — The United States and Russia say they have resolved a number of issues standing in the way of restoring a nationwide truce to Syria and opening up aid deliveries, but were unable once again to forge a comprehensive agreement on stepping up cooperation to end the brutal war that has killed hundreds of thousands.

After meeting off-and-on for nearly 10 hours in Geneva on Friday, U.S. Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov could point to only incremental progress in filling in details of a broad understanding to boost joint efforts that was reached last month in Moscow.

Their failure to reach an overall deal highlighted the increasingly complex situation on the ground in Syria — including new Russian-backed Syrian government attacks on opposition forces, the intermingling of some of those opposition forces with an al-Qaida affiliate not covered by the truce and the surrender of a rebel-held suburb of Damascus — as well as deep divisions and mistrust dividing Washington and Moscow.

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