樺太からふと千島ちしま交換こうかん条約じょうやくじゃなかったです
kara futo chi shimakōkanjōyakujanakattadesu

Noun
Desu Copula

The polite, past negative form of 樺太千島交換条約

1. It wasn't the Treaty of Sakhalin–Kuril Islands Exchange.

Past/Perfective
Negative
Polite
Casual Register