相互 そうご確証 かくしょう破壊 はかいじゃなかったです
sō gokakushōwa kaija nakattadesu

Noun
Desu Copula

The polite, past negative form of 相互確証破壊

1. Wasn't mutual confirmation destruction.; Wasn't mutual corroboration destruction.

Past/Perfective
Negative
Polite
Casual Register