瀬戸 せと さい外交 がいこうじゃなかったです
seto saiga ikōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 瀬戸際外交

1. Wasn't brinkmanship.; Wasn't last-minute diplomacy.

Past/Perfective
Negative
Polite
Casual Register