You don't need do decentralize it. You only need to make it easy to mirror content in case it's taken down. Wikipedia has a lot to lose by not complying (site getting blocked, donations cut off, etc.), but unaffiliated third parties don't. Get them to host censored content. Russian users can host German censored content, and German users can host Russian censored content. Combine this with a notice on every page that has content removed so people know when to look for it.