どくそ不可侵 ふかしん条約 じょうやくではありません
dokuso fukashin jōyakudewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 独ソ不可侵条約

1. It is not the Soviet-Japanese Non-Aggression Pact.

Negative
Polite
Formal Register