Senior U.S. military officials apparently believe North Korea still has a way to go before it can successfully target the U.S. mainland with missiles.

A Bloomberg news report quotes U.S. Navy Commander William Marks, a spokesman for the Defense Intelligence Agency(DIA), as saying the North's intercontinental ballistic missiles(ICBM) still have "important shortfalls." 

Marks does add that Kim Jong-un’s regime “continues efforts to expand its stockpile of weapons-grade fissile materials,” and has accomplished "some key milestones in specific short-range systems."

However, he says “there is still a lot of development needed before any of North Korea's known missiles can reach U.S. territory.

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