Source: BBCNews
US President Barack Obama has urged Turkey and Russia to reduce tensions, a week after Turkish jets shot down a Russian warplane.
After talks with Turkey's Recep Tayyip Erdogan in Paris, Mr Obama reaffirmed US support for "Turkey's right to defend itself and its airspace".
But he stressed that Russia and Turkey should "de-escalate" their dispute.
"We all have a common enemy," Mr Obama said, referring to the so-called Islamic State (IS) group.
"I want to make sure that we focus on that threat," he said.
"Turkey is a Nato ally," he added. "And we're very much committed to Turkey's security and its sovereignty. We discussed how Turkey and Russia can work together to de-escalate tensions and find a diplomatic path to resolve this issue."
US defence secretary Ashton Carter later said Turkey had to do more to combat Islamic State militants , saying it had not effectively controlled its borders to stop the movement of IS fighters.
Speaking in Washington, he urged Turkey to increase its resistance to the jihadists "both in the air and on the ground".
Mr Erdogan also spoke to reporters after Tuesday's meeting with the US president. He said his government wanted to reduce tensions and was "determined to keep up the fight" against IS.
Mr Obama and Mr Erdogan are among 150 leaders attending climate talks in Paris.
Mr Erdogan renewed his criticism of Russian air strikes against Turkmen rebels in north-western Syria, complaining that the area is being "continuously bombed".
Moscow says Turkey shot down its SU-24 warplane inside Syria on 24 November.
Turkey says the plane entered its airspace and was repeatedly warned to leave before it was downed.
Russia has insisted the plane did not cross the border and that it gave advance notice of the flight path to the US.
One Russian pilot was killed and the other rescued. A Russian marine was killed during the rescue operation.
'Terrorist haven'
Russia is a major ally of Syrian President Bashar al-Assad and its air strikes have targeted rebel groups, including IS.
However, Mr Obama said he expected Russia would eventually be convinced of the need for Mr Assad to leave power.