President Obama admitted Tuesday that the U.S. and other countries fighting the Islamic State have so far failed to convince Russia to join their cause, and that Russia is unlikely to drop its support for Syrian President Bashar Assad anytime soon.

Speaking in Paris, Obama said he's hopeful that Russia will eventually see that there is no military solution in Syria, and that it's unwise for President Vladimir Putin to get "bogged down" in Syria.

"I think it is possible over the next several months that we both see a shift in calculation in the Russians, and a recognition that it's time to bring the civil war in Syria to a close," he said.

But Obama also made it clear that Russia's support for Syria is too entrenched at this point to expect a quick turnaround from Russia.

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