South Korea's Defense Ministry announced on Friday that Seoul was willing to host an advanced United States anti-missile defence system called Terminal High Altitude Area Defense (THAAD).
"If THAAD is deployed by the US military in Korea, it will be helpful for our security and defence," South Korean Defence Ministry spokesman Kim Min-seok stated.
Kim indicated Seoul had never received any request from the US authorities to deploy the THAAD.
He added that the government will evaluate all possible measures to protect the country against potential North Korean nuclear and missile threats.
Foreign Ministry spokeswoman Hua Chunying said, "We believe that any country, when striving for its own security, should also consider other countries' security interests and regional peace and stability."
US military officials have said the THAAD is needed in South Korea, which is under threat from the North Korean missile programme.
The THAAD can pursue multiple ballistic missiles up to 2,000 km (1,200 miles) away and its effective range would reach deep into Russia and China.
The system is established by Lockheed Martin Corp and costs $885.6 million for each unit.