China reiterated on Tuesday its resolute opposition to the deployment of a US anti-missile defense system in the Republic of Korea after the system's first components arrived in the peninsula.

The ROK's National Defense Ministry said Seoul had begun assembling the Terminal High Altitude Area Defense system after part of its battery section was delivered, Xinhua News Agency reported.

"We've noticed the development. China will resolutely take necessary measures to defend its security interests, and all the consequences of that will be borne by the United States and the ROK," Foreign Ministry spokesman Geng Shuang said at a daily media briefing in Beijing.