U.N. Envoy Warns of New 400,000 Refugee Wave From Syria Amidst Renewed Conflict

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The talks come amid a renewed offensive by the Assad regime and its allies against rebel groups in and around Aleppo, which has been under intense bombardment and shelling.

Russia, which backs the Syrian government, said Wednesday that a 24-hour truce was planned for Aleppo province but couldn't be put in place because of attacks by a militant rebel group linked to al Qaeda, the Nusra Front.

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Short-term truces have been put into effect in northern parts of the western province of Latakia as well as parts of the capital, Damascus, to help buttress a nine-week cease-fire that is faltering across much of the country.

Russian and U.S. officials have been trying to arrange one in and around Aleppo. The U.S. has said talks were continuing.