Russia's President Vladimir Putin has said the Russian campaign in Syria seemed to be going well, although it was too early to discuss the result.
Speaking on Russian television, Mr Putin ordered Defence Minister Sergei Shoigu to continue to co-operate with United States, Turkey, Saudi Arabia, Iran and Iraq on Syria.
"We are aware of how difficult such anti-terrorist operations are. And of course it is too early to discuss the results. But the things that have been done so far deserve a high positive mark," he said.
Mr Putin also said that French President France Hollande had voiced the idea of uniting President Assad's forces with the Free Syrian Army to fight the so-called Islamic State.
But a source close to Hollande denied he had said this.
Russia started its air campaign in Syria saying it would target IS. But its planes have also bombed other rebel groups opposed to Syrian President Bashar al-Assad, Moscow's ally.
Western countries, Arab states and Turkey, who are waging their own bombing campaign against IS but also want president Assad to leave power, say Moscow is using IS as a pretext to target Assad's other foes.
Russia says the Assad government should be the centrepiece of international efforts to combat extremism.
It comes as the United States has said it will not co-operate militarily with Russia in Syria because its strategy is "tragically flawed".
However, it is prepared to carry out basic, technical discussions on pilot safety, US Defense Secretary Ash Carter said today.
"We are not prepared to co-operate in a strategy, which as we explained, is flawed - tragically flawed on Russia's part," Mr Carter added, renewing US accusations that Russia's strikes were not focused on Islamic State militants.
"I have said before that we believed that Russia has the wrong strategy - they continue to hit targets that are not ISIL. We believe this is a fundamental mistake," Mr Carter said, referring to the Islamic State group by an alternative name.
"Despite what the Russians say we have not agreed to cooperate with Russia so long as they continue to pursue a mistaken strategy and hit these targets."
Russia had said it shares the West's aim of preventing the spread of IS militants who have seized much of Syria since civil war grew out of anti-government protests in 2011.
It had been suggested that Russia would implement US proposals aiming to co-ordinate its strikes in Syria with the US-led coalition.
"On the whole, these proposals could be put in place," a Russian official said.
But fighters on the ground and Western nations have said Russia has mainly targeted rebel groups that have seized government-held areas in western Syria, and is aimed at shoring up President Assad.
Syrian state media made no mention of the co-ordinated attacks, reporting instead that Russian aircraft had targeted IS positions in the Aleppo countryside, where its fighters hold territory.
The Russian defence ministry said today that Washington's refusal to share intelligence with it about the positions of IS militants showed the US was looking for an excuse not to fight terrorism.
"Our partners from other countries who see a real enemy in Islamic State which must be destroyed actively help us with data about bases, warehouses, command points and terror training camps," said Major-General Igor Konashenkov, a ministry spokesman.
"But those who seem to have a different opinion about this terrorist organisation are constantly looking for reasons to refuse us co-operation in the fight against international terrorism," he said, referring to the US government.
Meanwhile, Syria-based missile systems harassed Turkey's warplanes yesterday while eight F-16 jets were on a patrol flight along the Syria border, the Turkish military said today.
Russian aircraft twice entered Turkish air space at the weekend and Turkey says an unidentified MIG-29 harassed its jets on Monday, prompting the foreign ministry to summon the Russian ambassador three times in protest.
