Secretary of State John Kerry says the US is on the verge of ending Syria talks with Russia.
Kerry says such discussions are "irrational" at a time when Russian and Syrian warplanes are bombing Aleppo. He says the US has no indication of Russia's "seriousness of purpose."
The US has been working with Russia for months to try to secure a cease-fire in Syria. The latest truce collapsed last week after several days of relative calm.
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Kerry said only that the US would "have to pursue other alternatives for a period of time.
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