Prosecutor General, Iryna Venediktova, says Ukraine is investigating more than 21,000 war crimes and crimes of aggression allegedly committed by Russia since the start of the February 24th invasion.
Ms Venediktova told the BBC she was receiving reports of between 200 to 300 war crimes a day.
She admitted that many trials would be held in absentia.
However, she stressed it was “a question of justice” to continue with the prosecutions.
Russia denies all war crime allegations.
In an interview with the BBC’s World Service Outside Source programme, Ms Venediktova warned Russian soldiers who killed, tortured or raped civilians “should understand that it’s only a question of time when they all will be in court”.
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