“The Defense Ministry of South Korea said Tuesday that North Korea appeared to have made a ‘significant’ advance toward making a nuclear warhead small enough to fit onto a long-range missile capable of reaching the West Coast of the United States. The ministry, which included the assessment in its latest white paper, also suggested that the North now had a missile that could fly that far.”
Source: North Korea Has Made ‘Significant’ Advances in Nuclear Arms Program, South Says – NYTimes.com