Russia’s military has begun patrolling a demarcation line in eastern Syria between zones controlled by the US-led international coalition’s forces and Russian forces, according to the TASS news agency.

“It’s the line that separates the territory controlled by the international anti-terrorist coalition, known as the ‘East,’ from the territory controlled by Russia’s forces, known as the ‘West.'” “There have been no patrols by Russian servicemen until now,” a spokesman for Russia’s military was quoted as saying.

According to the spokesman, there are potential ISIS sleeper cells in the area, and Russia’s military is attempting to demonstrate its presence.