China is shunning a security dialogue in Seoul amid an ongoing row over South Korea's decision to deploy a powerful U.S. missile defense system.

The official newspaper Global Times quoted an unidentified Defense Ministry spokesman as saying China was not sending a delegation to this week's Seoul Defense Dialogue because of "reasons of work arrangement." It offered no other details.

China opposes the deployment of the U.S. Terminal High Altitude Area Defense, or THAAD, whose radars it says will allow the U.S. military to peer deep into northeastern China. Seoul and Washington say the system is intended solely to defend against North Korea's missile threat.

China elevated the issue on Monday, with President Xi Jinping expressing China's opposition directly in a meeting with his South Korean counterpart Park Geun-hye.