Sometimes I think Russia is probably less likely to have the capability to have long term success at a technical method of attacking/blocking a tool such as Tor, then it would have at an attack on the people who maintain it. Ultimately most of it is still maintained by a relatively small group of [awesome!] people. From my experience of training NGOs/journalists etc there is a global increase in such clever methods of disruption being used by bad adversaries.
A sophisticated "gloves off" human intelligence operation to disrupt, deny and delegitimise the small group responsible for it would probably be a more cost effective and successful operation - and would probably play into Russia's strengths. I realise that some in UK and elsewhere have done this to some extent but I think Russia would probably capable of taking these efforts much, much further.