A coalition of opposition parties in the Central African Republic has called on Russian private security forces to leave the country.
The group says it is organising protests against the Russians, who it accuses of abusing civilians whilst fighting rebels.
The contractors are said to have killed 10 villagers and burned homes in the north-eastern Haute-Kotto region.
The Russians have been training and fighting alongside the security forces in the Central African Republic.
The United Nations Working Group on Mercenaries recently said it had received reports of the contractors committing grave human rights abuses.