Obama and Hollande also urged Russia and Turkey not to let the situation escalate after Turkey, a NATO ally, said it shot down a Russian warplane near the Turkish-Syrian border after it repeatedly violated Turkish air space.

Obama said the United States did not have enough information yet to form conclusions about the incident but added similar confrontations could be avoided if Russia stopped attacking 'moderate' Syrian rebels who are battling forces loyal to the government of President Bashar al-Assad.

Russia condemned the Turkish action, vowing severe consequences.  Obama and Hollande spoke at a White House news conference as the French president visited Washington to coordinate a stepped-up military campaign against Islamic state following the November 13 attacks in Paris that killed 130 people.

Hollande will meet Russian President Vladimir Putin on Thursday in Moscow as part of a series of talks to increase  international pressure on Islamic State after the Paris attacks. Hollande said France was already coordinating with Russian ships in the eastern Mediterranean since the French Charles De Gaulle aircraft carrier arrived in the region on the weekend.

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