uriminzokkiri is a north korean page where you can find news, comics (it seems) and stuff about DPRK in choson or english if you want sum DPRK internet experience… anyways, DRPK is telling everyone that: “stop threating us with missiles, you fuckers!”
The issue is not exactly with the yield. There are other factors - ash thrown into the air, radiation contamination, automated launch detection systems in other nuclear powers. A nuclear war between Koreas will very likely affect Russian far east for example.