I didn't read the book but it is worth noting that those ideas are Dugin's personal opinion (of course there might be people who support it, for example there are people that dream of reviving Soviet Union). It is not official Moscow's policy.

Also ethnic Russian domination might be a bit difficult because in Russia itself there are many different ethnic groups [1] that wouldn't approve this idea.

[1] https://en.wikipedia.org/wiki/Ethnic_groups_in_Russia