Air strikes on a camp in northwest Syria run by opposition fighters backed by Turkey killed at least 20 people on Monday, a war monitor and an opposition source said. The opposition source said Russian strikes targeted the Failaq al-Sham faction in their base close to the border with Turkey, killing 20. The UK-based Syrian Observatory for Human Rights put the death toll at 34, with dozens wounded. Syrian government forces, backed by Russian air power, have driven rebels back to a pocket of territory adjoining Turkey after more than nine years of conflict triggered by protests against President Bashar Assad in 2011. Ankara sent thousands of troops into the region this year to stall the Syrian government advances and prevent an influx of refugees from the Idlib border region into Turkey. Mondays air strikes targeted the camp near Kafr Takharim, about 10 km (6 miles) from the Turkish border in Syrias Idlib province, the opposition fighter said.