かく拡散かくさん防止ぼうし条約じょうやくでしょう
kakukaku sambō shi jōyakudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 核拡散防止条約

1. Probably the Nuclear Non-Proliferation Treaty.

Polite
Presumptive
Conjecture