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U.S. Secretary of State John Kerry and Russian Foreign Minister Sergey Lavrov met in Switzerland Wednesday. Kerry pressed Russia to use its influence to get Syrian President Bashar al-Assad to allow humanitarian aid to all Syrians in need. The meeting took place at a time of heightened concern that Monday's scheduled start of the United Nations-mediated talks on a political transition in Syria is in jeopardy. There is widespread disagreement over which opposition groups should take part in the U.N. talks.