South Korean President Moon Jae-in attends a news conference in Berlin. Reuters/Michele Tantussi

Beijing may increase its retaliations against Seoul after South Korean President Moon Jae-in ordered the installation of four additional launchers for the US-led Terminal High Altitude Area Defense system (Thaad), Korea JoongAng Daily reported.

The US Defense Department said Monday it is ready to resume deployment of the Thaad system as quickly as possible.