NATO has called an extraordinary meeting (Tuesday 16GMT) to discuss the shooting down of a Russian plane by Turkey along its border with Syria.
Moscow says the Su-24 crashed on the Syrian side of the border, and denies it had violated Turkish airspace.
Both pilots ejected from the plane, but Syrian rebel forces say at least one of them is dead.
Russia began air strikes in Syria in late September and has been accused by western powers of supporting the government of Bashar al Assad rather than prioritising the targeting of Islamic State militants.
Brussels correspondent Jack Parrock says NATO has called a meeting to discuss the alleged airspace violation of Turkey, a member of the military alliance.
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Brussels correspondent Jack Parrock says NATO was already critical of Russia over its operations in Syria.
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It comes with French President Francois Hollande due to hold talks in Washington with US counterpart Barack Obama in the wake of the Paris attacks.
Washington correspondent Simon Marks says the shooting down of the Russian jet will now be factored into those discussions about how to counter the Islamic State.
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