U.S. Vice President Kamala Harris sais that Russia is responsible for a “widespread and systematic attack” against Ukraine’s civilian population Sergei Supinsky/AFP via Getty Images

“But yes, there’s no question that Russia is committing crimes against humanity,” he continued, “and we’re right to say so.”

On Friday, shortly after Ukrainian President Volodymyr Zelenskyy spoke via video to the gathering of officials and experts here, Andriy Yermak, the chief of Ukraine’s presidential office, said his country wouldn’t feel safe until Russia’s leadership was punished.

“The fastest and easiest way to build the security of Ukraine and the whole world is to create a special tribunal to try the Russian leadership for the crime of aggression. Europe and the entire civilized world understand why it is necessary,” he said at the opening of the “Ukraine is You” exhibit.

Last November, human rights organization Amnesty International said Russia was “likely” committing crimes against humanity, citing instances of the forceful transfer and deportation of people from Ukraine.