I enjoy reading dead tree books as much as anyone, and whilest the publisher/distributor can’t take it away, there are plenty of ways you can lose access to them. Fire and flood being the two obvious ones, whereas digital books can be backed up offsite. It’s also easier to carry many books when they’re digital compared to physical.
For books I care about I try to get both a physical and a (drm free) digital copy for the best of both world.
Let’s face it, it’s a countries leader(s) that decide to feed their population into a meat grinder, not the people themselves. At this point there may ne little the average Russian can do to stop the process, at least, without significant retribution from the same government.