A senior Ukrainian investigator claims more than 400 graves have been found at a 'mass burial site' in an eastern city recently taken back from Russian control.
President Volodymyr Zelenskyy's confirmed it, but says more 'verified information' will come later.
A top police officer says he's aware of other sites across the Kharkiv region.
MP Lisa Yasko says atrocities by Moscow's forces aren't anything new anymore.
