Russia has grown its gold reserves drastically over the last decade, has relatively little debt and is increasingly trading with China without using US dollars at all.

I'd say they've anticipated those serious economic repercussions to some extent. But I also suspect Russians may be more willing to tolerate things such as a weak economy if it helps achieve other goals. I kind of see it like a parallel with Russia shooting a bullet at its own economy, while the Soviet Union in the 20th century shot plenty of bullets at its own people...for various reasons.