U.S. President Barack Obama urged Turkey on Tuesday to reduce tensions with Russia that are hampering efforts to fight Islamic State militants in Syria and stressed that U.S. support for its NATO ally's security remained steadfast.

Obama met Turkish President Tayyip Erdogan in Paris, where they have been attending an international climate summit, a week after Turkish jets shot down a Russian warplane along the Syrian border.

"The United States supports Turkey's right to defend itself and its airspace and its territory," Obama said. "We discussed how Turkey and Russia can work together to de-escalate tensions and find a diplomatic path to resolve this issue."

Obama told Erdogan that the Islamic State militant group, also known as ISIL, was the entity that all sides needed to pursue, echoing a message he delivered to Russian President Vladimir Putin in Paris on Monday.

"We all have a common enemy, and that is ISIL, and I want to make sure that we focus on that threat," Obama said.

Tensions between Russia and Turkey have complicated U.S. efforts to prod Moscow into steering its military might towards Islamic State rather than the moderate Syrian opposition. Putin supports Syrian President Bashar al-Assad, while Obama and Erdogan want him to go.

The downed plane incident has been further exacerbated by the strong personalities of the Russian and Turkish leaders. Obama's relationship with Putin is tense but direct. His relationship with Erdogan, whom he referred to by first name, is also not close, though the two men are in contact frequently.

COMMUNICATIONS CHANNELS

Turkish Prime Minister Ahmet Davutoglu called for the opening of communication channels between Turkey and Russia to prevent further incidents like the downing of the warplane.

Putin, who has signed a decree imposing economic sanctions on Turkey over the incident, has said Turkey shot down the jet because it wanted to protect supplies of oil from Islamic State militants. Erdogan says claims that Turkey buys oil from Islamic State are "slander".

While both Erdogan and Davutoglu have said they do not want an escalation in tensions with Russia, they have also indicated they have no intention of issuing an apology for the downing of the jet, as Moscow has demanded.

Erdogan said following the meeting with Obama that tension with Russia was harming both countries.

"The tensions in the region sadden us. It is causing harm to both sides," he said. "Our concern is to not come out badly from this, but on the contrary to turn this into peace and contribute to the peace in the region," Erdogan said.

Obama said the U.S. was eager to accelerate work on its military-to-military relationship with Turkey to ensure its NATO ally was safe and to help resolve the conflict in Syria.

In Moscow, Kremlin spokesman Dmitry Peskov said similar ties between Russia and Turkey had failed.

"Military channels existed and were meant to not allow such tragedies. These channels didn't work and not through the fault of the Russian side," he said.