| Eastern Aleppo has come under intense aerial bombardment for the past week |
Russia has said it will carry on bombing rebel-held eastern Aleppo in Syria, defying US demands to stop.
| Russian-backed Syrian government forces have launched a concerted campaign to recapture Aleppo |
He said the conflict presents extremists with an opportunity to "exploit the vacuums" in the region and launch attacks "against Russian interests, perhaps even Russian cities".
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His comments echo a statement from Moscow, which insisted it would send diplomats to Geneva to discuss ways of normalising the situation with the US.
But on Wednesday US Secretary of State John Kerry warned his Russian counterpart Sergei Lavrov that Washington will end talks unless Moscow stops its bombardment of Aleppo.