If the Japanese nuclear reactor goes into the complete meltdown, which countries would be in danger?

I am not sure the ken and barbie news service are able to accurately report whether or not a reactor core is melting down and uncontrolled.With all due respect to these two atomic scientists (ken and barbie) I don't think we would really know how lethal or non lethal any amount of radiation leaked is until people start dropping dead around us . . .or not.