Britain, France, the United States and Ukraine on Tuesday blocked a Russian request to add two Syrian rebel groups to a UN terror blacklist and sideline them from the Syrian peace process, diplomats said, according to AFP.

Russia had requested that Jaish al-Islam (Army of Islam) and Ahrar al-Sham be added to the sanctions list for their ties to Al-Qaeda and the "
"Islamic State" (ISIS) terrorist group.

Adding names to the UN sanctions list requires a consensus decision from the 15-member council and after objections were raised by the four countries, Russia's request was rejected.