"There is always a risk of getting bogged down but in Moscow they're talking about three to four months of operations," Alexei Pushkov, the head of the foreign affairs committee of Russia's lower house of parliament, told France's Europe 1 radio.
Pushkov said more than 2,500 air strikes by the US-led coalition in Syria had failed to inflict significant damage on the jihadist Islamic State group, but Russia's campaign would be more intensive to achieve results.
"If you do it in a more efficient way, I think you'll see results," he said.
Pushkov refuted suggestions from Western nations that Russian planes were mainly bombing not IS jihadists, but rebel groups opposed to Syrian President Bashar al-Assad.
"The main target are the Daesh groups situated closest to Damascus," Pushkov said.
"We need to eliminate this group or at least neutralise it and afterwards we'll see what Syria's future is," he said.
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