Let's see... From top of my head: Boris Nemtsov, Alexey Navalny, Ekaterina Shulman, entire Anti-Corruption Foundation and more than half of alive Russian soldiers(counting dead soldiers more than 2/3).

"This is not war of Russia and Ukraine. I an against such definition. This is Putin's war."

- Boris Nemtsov, before he was shot on bridge near Kremlin wall

P.s. funny story about soldiers. Some idiots(thank you, idiots!) from Omsk decided to open voting station near front line for governor and regional parlament. Since soldiers officially don't have internet, there was no Remote Electronic Voting(ДЭГ) and 100% voted with paper. And since paint protocols and stuff boxes is scary in front of armed men, it wasn't done at usual scale. In result hard-core pro-war United Russia governor candidate got less than 50% and I think even lost on those stations.