Tensions between Russia and the West are aggravating talks about the future of one of the United Nations’ biggest and most perilous peacekeeping operations, the force sent to help Mali resist a decade-long Islamic extremist insurgency, AP reported.

The U.N.’s mission in the West African nation is up for renewal this month, at a volatile time when extremist attacks are intensifying. Three U.N. peacekeepers have been killed this month alone. Mali’s economy is choking on sanctions imposed by neighboring countries after its military rulers postponed a promised election. France and the European Union are ending their own military operations in Mali amid souring relations with the governing junta. 

U.N. Security Council members widely agree the peacekeeping mission, known as MINUSMA, needs to continue. But a council debate this week was laced with friction over France’s future role in Mali and the presence of Russian military contractors.

The peacekeeping mission began in 2013, after France led a military intervention to oust extremist rebels who had taken over cities and major towns in northern Mali the year before. MINUSMA now counts roughly 12,000 troops, plus about 2,000 police and other officers. More than 270 peacekeepers have died.