Speaking to reporters at the residence of the US ambassador to France, Kerry said the ceasefire envisioned by the political process agreed upon in Vienna on Saturday would exponentially help efforts to fight the Islamic State group, which has claimed responsibility for the Paris attacks that killed 129 people, as well as end the drawn-out Syrian conflict, which has gone on for over four years.
"We are not talking about months, we are talking about weeks hopefully," he said.
Saudi Arabia is expected to host a meeting of Syrian opposition figures by mid-December, at which they are to agree on a delegation to send to talks with representatives from President Bashar Assad's government. Once those negotiations begin, a ceasefire is to take effect, according to the agreement reached in Vienna.
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"Out of this event in Paris will come an even greater level of vigilance and cooperation in some places that may have been a little bit less concerned about things hitting them in certain parts of the world," Kerry said.
Kerry began his day today in meetings with staffers at the US Embassy in Paris and French President Francois Hollande.
With Hollande, Kerry said the civilized world must boost its efforts to combat the Islamic State by going after the group at its core.
"We have to step up our efforts to hit them at the core where they're planning these things and also obviously to do more on borders in terms the movement of people," he said.