樺太からふと千島ちしま交換こうかん条約じょうやくであれば
kara futo chi shimakōkanjōyakudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 樺太千島交換条約

1. If the Sakhalin-Kuril Islands Exchange Treaty…; Were the Sakhalin-Kuril Islands Exchange Treaty…

Ba Conditional