"My bite-sized analysis for the BBC: North Korea: 'Grave moment' as North tests missile fired from sea"

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North Korea: 'Grave moment' as North tests missile fired from sea

But this one, fired from a platform at sea, was capable of being launched from a submarine.

Being submarine-capable is important as it means North Korea could launch missiles far outside its territory.

According to South Korean officials, the missile flew about 450km (280 miles) and reached an altitude of 910km before landing in the sea.

That means the missile flew twice as high as the International Space Station, but previous North Korean tests have gone higher.

It came down in the Sea of Japan, also called the East Sea. Japan said it landed in its exclusive economic zone.