US Anti-Missile System Operational in South Korea
The US military says its controversial Thaad missile defence system is now operational in South Korea.
The system can intercept North Korean missiles although full operational capability is still some months away.
Tensions have been rising around the Korean peninsula, with repeated threats from North Korea and the presence of a group of US warships and a submarine.
North Korea reacted angrily to the latest military exercise, accusing the US of risking a nuclear war.
The rise in tension comes only a day after US President Donald Trump said he would be “honoured” to meet North Korean leader Kim Jong-un, in the right circumstances.