North Korea fires two missiles into sea, South Korea says

NORTH Korea has fired two short-range ballistic missiles into the sea off its east coast city of Wonsan, flying approximately 500 kilometres, South Korea's military says.

Reuters reports that North Korea has a large stockpile of short-range missiles and is developing long-range and intercontinental missiles.

Reports of the missiles being fired coincided with already heightened tension on the Korean peninsula after the North conducted its fourth nuclear test in January and launched a long-range rocket last month, leading to new UN Security Council and bilateral US sanctions.

The North fired six rockets into the sea from Wonsan last week using a multiple launch rocket system, supervised by leader Kim Jong-un, who ordered his military to be prepared to launch pre-emptive attacks against enemies.

Mr Kim said on Wednesday his country had miniaturised nuclear warheads to mount on ballistic missiles and ordered improvements in the power and precision of its arsenal in his first direct comment about nuclear warhead miniaturisation.