I assume this is just a word-for-word translation for "зона полного разрушения". If you "detonate" 100M Tzar Bomb on https://nuclearsecrecy.com/nukemap/ https:

I assume this is just a word-for-word translation for "зона полного разрушения". If you "detonate" 100M Tzar Bomb on https://nuclearsecrecy.com/nukemap/ https://nuclearsecrecy.com/nukemap/ it tells you that >Moderate blast damage radius (5 psi): 32.6 km So I assume that the “ring of absolute destruction” ~= "Moderate blast damage radius"