In Geneva on Wednesday, UN envoy Staffan de Mistura suspended attempts to begin a dialogue between Bashar al-Assad`s regime and the Syrian opposition.
Alongside Britain`s Foreign Minister Phillip Hammond, Kerry read out sections of UN Security Council resolution 2254, passed in December, calling for an immediate ceasefire.
"Russia has a responsibility, as do all parties, to live up to it," he said.
"So I had a conversation this morning with Foreign Minister Lavrov. We discussed, and we agreed, that we need to discuss how to implement the ceasefire."
Kerry also said that both parties to the conflict -- the rebels and the regime and its allies -- must allow access to besieged areas for humanitarian aid.
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