noun, noun which may take the genitive case particle 'no'
suspicion of having nuclear weapons; nuclear suspicion
Used in political and security contexts when a country or entity is suspected of possessing or developing nuclear weapons. Often appears in news reports and diplomatic statements.
Suspicions that the country has nuclear weapons are growing in the international community.
To clear up the nuclear suspicion, they should accept inspections.
核開発疑惑 explicitly mentions development, whereas 核疑惑 is broader and can include mere possession.
Compound of 核 (kaku, 'nuclear') and 疑惑 (giwaku, 'suspicion'). The term likely emerged in the late 20th century in the context of nuclear non-proliferation discourse.