South Korean President Park Geun-hye said on Thursday the move to deploy a THAAD missile defence system was “inevitable” because of a growing threat from North Korea and that division in the South over its deployment is what Pyongyang seeks. North Korea’s launch of three ballistic missiles on Tuesday was the latest evidence that the anti-missile system is needed, Park said at a National Security Council meeting. This month’s announcement by South Korea and the United States to deploy a Terminal High Altitude Area Defence (THAAD) unit with the US military in a rural melon-farming county in the South triggered loud protests from residents worried about possible negative health and environmental impacts. If we continue to be divisive and social confusion grows ... it would be exactly where North Korea wants us to go President Park Geun-hye “If we continue to be divisive and social confusion grows about a decision we had no choice but to make to protect the country and the lives of our people, it would be exactly where North Korea wants us to go,” Park said, according to her office. North Korea said on Wednesday it had conducted a ballistic missile test that simulated pre-emptive strikes against South Korean ports and airfields used by the US military, likely referring to the three missiles fired on Tuesday. Shell shock: South Korean PM egged at protest against US missile defence system The missiles flew between 500km and 600km into the sea off its east coast and could have hit anywhere in South Korea if the North intended, the South’s military said. Many residents of Seongju, about 200km from the capital Seoul, joined by opposition members of parliament and civic groups, have demanded the government scrap the decision to site the THAAD battery there. Thousands of Seongju residents were expected to hold a protest rally in central Seoul later on Thursday. South Korea announces site for US anti-missile system opposed by China That follows a raucous stand-off last week between residents and the country’s prime minister, who was pelted with eggs and plastic bottles and trapped inside a bus for several hours when he visited the county to explain the THAAD decision. Some residents blamed outside leftist activists for the incident. Park said North Korea could stage an act of aggression at any time, including possibly a fifth nuclear test or cyber attack against the networks of national and financial institutions. The North has also increased military equipment near the land and sea border separating the countries, she told the security meeting. The two Koreas remain technically at war under a truce that ended fighting in the 1950-53 Korean war. Tension on the Korean peninsula has been high since North Korea conducted its fourth nuclear test in January and followed that with a satellite launch and a string of test launches of various missiles.