Not so hot if you're Belorusian.
Not really, because 1) there are few military-serviceable roads between Ukraine and Belarus, which contributed to the Russian failure in February-March 2022---the geography is mostly heavy woodlands, thickets, low rocky hills, and swamplands, and 2) the Chernobyl Exclusion Zone lies squarely between Kyiv and Belarus.
Remember what happened to all those Russian soldiers who dug in there?
Unprotected Russian soldiers disturbed radioactive dust in Chernobyl's 'Red Forest', workers say
Russian forces suffer radiation sickness after digging trenches and fishing in Chernobyl