Chernobyl 20 years later, just from one of three reactors at a single plant. Only 10 percent of the radiation escaped and caused such a nightmare for neighboring countries. Imagine the world after destroying several with tactical nukes.
Belorussia is a separate country. PLEASE NOTE, the neighboring country suffered more than the country where the disaster took place. Radiation has an international nature and does not need invitations or visas to travel. The evil, dark wind of that day carried 70% of Chernobyl‘ s heavy radiation into the neighboring country of Belorussia.