Russia's says a UN human rights report criticising pro-Russian separatists in eastern Ukraine was "hypocritical".
The paper on fighting in the region argued that "a reign of fear and terror" had been inflicted on the people by armed militia backed by Russia.
It suggested rebels were using torture and detention to "exercise their power over the population in raw and brutal ways".
Russia's Foreign Ministry described the report as "unobjective and even hypocritical", adding that it failed to mention the detentions of Russian journalists in eastern Ukraine and the reported use of heavy rockets by the Ukrainian army against civilians.
More top news
Social workers are struggling to deal with a "significant increase" in online child sex abuse, a new report warns.
The police officer who shot dead Michael Brown says he has a clear conscience over his actions.
The three-year-old boy was reported to have repeatedly said "mummy shot" after the tragic accident.