Yes, the United States Used Biological Weapons on North Korea
Opinion — It’s sort of silly that it matters. The United States bombed North Korea flat with ordinary, non-bioweapons bombs. It ran out of standing structures to bomb. People lived in caves, if they lived. Millions died, most of them from regular old non-scandalous but mass-murderous bombs (including, of course, Napalm which melts people but doesn’t give them exotic diseases).