不可侵 ふかしん条約 じょうやくじゃなかったです
fukashin jōyakujanakattadesu

Noun
Desu Copula

The polite, past negative form of 不可侵条約

1. Was not an inviolable treaty.; Wasn't a treaty that couldn't be violated.

Past/Perfective
Negative
Polite
Casual Register