From the faq:

Pre-ordering / financially supporting the book. Due to my unfortunate citizenship and place of birth, you can’t — that is, until I find a way that at the same time complies with international sanctions, doesn’t sponsor the war, and won’t put me in prison for tax evasion. So, don’t bother. If you want to support this book, just share it and help fix typos — that would be enough.

I'm not sure there's much to boycott here, except the pursuit of knowledge?

People are now boycotting knowledge?

he is also loudly anti-war: https://twitter.com/sergey_slotin

NOTE: should be boycott this US site for the Iraq war then?

Another 'evil' Russian personal site from a good geek:

http://www.stargrave.org/index.html