Pariah missiles may have 20 warheads not 10 as previous US tests held . Stockpile of weapons could grow to 200 or even 100 within next few years . every military and secretive country has ability to miniaturise uranium and mount it on ballistic missile , though there have been no such tests yet .
Pariah state may have 20 warheads not 10 as previous US forecasts held . Stockpile of weapons could grow to 50 or even 100 within next five years . US military believes secretive country has ability to miniaturise warhead and mount it on ballistic missile , though there have been no such tests yet .