Washington is trying to “demonize Russia” and “fuel the Ukrainian crisis” by accusing Moscow of crimes against humanity, Russian Ambassador to the U.S. Anatoly Antonov said on Sunday.

U.S. Vice President Kamala Harris announced Saturday that Washington has formally determined that Russia is committing crimes against humanity in Ukraine, in an address at the Munich Security Conference in Germany.

In a message on the social media network Telegram, Antonov said: “We consider such insinuations as an attempt, unprecedented in terms of its cynicism, to demonize Russia in the course of a hybrid war, unleashed against us. There is no doubt that the purpose of such attacks is to justify Washington’s own actions to fuel the Ukrainian crisis,” he said.

Harris had said Russia is responsible for a “widespread and systematic attack” against Ukraine’s civilian population, committing war crimes — as the administration formally concluded last March — and illegal acts against non-combatants. She cited evidence of execution-style killings, rape, torture and forceful deportations.

The Biden administration will continue to assist Ukraine in investigating these alleged crimes, she said, pledging to hold “to account” the perpetrators and “their superiors.”

“Let us all agree: on behalf of all the victims, both known and unknown: justice must be served,” Harris added.