A report by Amnesty International has said that at least 200 people were killed in air strikes carried out by Russia over Syria.
The report stated that research was carried on more than 25 attacks by Russia in five areas between 30 September and 29 November.
The conclusion was that there were serious shortcomings by Russia in respect of international humanitarian laws.
Moscow has repeatedly denied that it had caused civilian deaths.
Russia began attacking ISIS militants and other groups from the air on 30 September and said that it was doing so on the request of the Syrian President Bashar al-Assad.