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Linus Torvalds affirms expulsion of Russian maintainers
(www.theregister.com)
This is a most excellent place for technology news and articles.
I would encourage that, but if your instance doesn't defederate them you may have to go a bit farther since you'll still get replies from lemmy.ml users, as users are not blocked as part of this functionality. And that is by design, it's not meant to act as a replacement or alternative to defederation, it's meant to act as an alternative to blocking all communities on an instance.