North Korea has fired a long-range rocket, which critics say is a test of banned missile technology.
The launch was condemned by Japan, South Korea and the US, who have requested an emergency meeting of the UN Security Council.
South Korea says it is to begin discussing with the US the deployment of a missile defence system.
Senior defence official Ryu Je-Seung said if the THAAD missile system – considered one of the most advanced in the world – were deployed it would be only to counter the threat from the North.
North Korea fires long-range rocket despite warnings
