"At the same time, I want to stress that the action of this weapon does not contaminate the environment, in contrast to a nuclear one."
Do you wonder what it is? What breakthrough weapon Russia had made that doesn't pollute the environment - the eco-friendly weapon? It is what they call "FATHER OF ALL BOMBS"!
It is a fuel-air explosive massive vacuum bomb that first spreads the explosive wide in the atmosphere by a small detonation and ignites the atmosphere by the second detonation creating a very high temperature and powerful shock-waves under which 'all that is alive merely evaporates'!
So it leaves no harmful byproduct, no soot, no radiation even no biotic organisms that may contaminate the environment in future by trying to live its life!
The breakthrough progress in the history of mankind!