This site gives a decent overview of the first Chechen war that occurred between Russia and Chechnya. Russia used a lot of dirty tactics throughout the civil war and committed various human rights abuses against the Chechens, but due to the current UN security council set-up nothing really could have been done to force Russia to allow human rights groups in the conflict area. Because of this most of the accusations against Russia are in the speculative realm, but some things including the bombing of the Chechen capital (Grozny) are irrefutable. There have been accusations that both the first and the second chechen war were genocides committed by Russia. However, under the current international definition of genocide Russia clearly has not committed genocide, but genocidal acts can be argued by groups sympathetic to the Chechen cause.