It is sad. The Russian military action in Ukraine is not supported by many Russians. This is mostly, if not all, Putin.
In addition, Russian is not the U.S. or the U.K. or the E.U. Russian is an autocratic nation. Putin is the dictator that runs the country. Russian nationals can protest, but the risk imprisonment or worse. It is hard for Russian citizens to conduct an armed revolt as firearms are strictly regulated and any type of firearm that might be effective in battle is prohibited. Even possessing 1 bullet for a rifle sends you to prison.