U.S. President Barack Obama, right, listens to Russia’s President Vladimir Putin before the opening of the first plenary session of the G-20 Summit in Los Cabos, Mexico, Monday, June 18, 2012.

Kremlin spokesman Dmitry Peskov said on Tuesday that dialogue between Moscow and Washington on solving the Syria crisis was indispensable.

Peskov made the comments when asked whether talks on Syria were possible between Russian President Vladimir Putin and U.S. President Barack Obama.

However, Putin also said on Tuesday that it’s impossible to defeat the extremists from the Islamic State of Iraq and Syria (ISIS) group without cooperating with the Syrian government.

Speaking on Tuesday at a meeting of a Moscow-dominated security alliance of ex-Soviet nations in Tajikistan, Putin said that Moscow has provided military assistance to President Bashar Assad’s government and will continue to do so.

He shrugged off allegations that Moscow’s support for Assad has sparked a flow of refugees, saying in a televised statement that without Russia’s support for Assad’s regime the number of Syrian refugees heading to Europe would have even bigger.

The U.S. says that Russia is in the midst of a steady military buildup at a Syrian airport, indicating Moscow intends to create an air operations base there, although no fighter jets or helicopters have arrived yet.

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