yeah i would be careful with the phrasing “once they stop killing fellow Europeans”–it is not ordinary russian citizens doing the killings, and even if it may be correct that they tacitly or actively support the government doing such killings the same charge can be put against pretty much any existing government. (there are also other factors like the high level of propaganda and repression russian dissidents face for speaking out, which incentivizes people who truly oppose these actions to not openly do so. many people were arrested in the early days of the war doing this.)