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This undated picture released from North Korea's official Korean Central News Agency (KCNA) on June 23, 2016 shows a test launch of the surface-to-surface medium long-range strategic ballistic missile Hwasong-10 at an undisclosed location in North Korea.
The Musudan -- also known as the Hwasong-10 -- has a theoretical range of anywhere between 2,500 and 4,000 kilometres (1,550 to 2,500 miles).
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on June 23, 2016 shows a test launch of the surface-to-surface medium long-range strategic ballistic missile Hwasong-10 at an undisclosed location in North Korea.
The Musudan -- also known as the Hwasong-10 -- has a theoretical range of anywhere between 2,500 and 4,000 kilometres (1,550 to 2,500 miles).

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As US Defense Secretary James Mattis visits South Korea, CNN's Paula Hancocks looks at what he's facing in North Korea.