In a statement on January 24, HRW accused riot police of brutally beating several people, including a 17-year-old, after detaining them on January 20 during a standoff in Kyiv.
Yulia Gorbunova, HRW's Ukraine researcher, said the treatment of Mikhailo Niskoguz -- who was beaten, stripped naked, and humiliated -- amounted to "torture."
HRW also called for an independent investigation into the abduction of two activists, Ihor Lutsenko and Yuriy Verbytsky.
Lutsenko was later dumped, alive, in a forest after enduring what he described as at least three mock executions.
Verbytsky's body was found in a forest outside Kyiv and showed signs of torture.
HRW says several factors point to the possibility that the abductors were in collusion with law enforcement and security services.