Any nuke going off would be considered genocide, which would mean any Russian official who steps one inch out of the Russian Empire could be immediately arrested and charged with genocide. And don’t bring up Hiroshima or Nagasaki-they started the war.
If it got to the point Russia felt like they need to to use nukes, do you really think they would give a sh!t if they got charged with genocide? Anyway, they wouldn’t be charged with genocide if they used tactical nukes on certain targets.