The US says it has begun deploying the first parts of a controversial missile defence system in South Korea, BBC reports.
The Terminal High-Altitude Area Defense system (Thaad) is designed to protect against threats from North Korea.
The move to begin installing the system comes a day after the North launched four ballistic missiles, breaking international sanctions.
But the US-South Korean arrangement has angered many in North around the region, including China.
Chinese foreign spokesman Geng Shuang said on Tuesday that China resolutely opposed its deployment.