South Korea must respond to the United States' unprecedented trade pressure with unwavering principle, the chief of the country's leading international traders organization said Tuesday.

"South Korean representatives need to sit down at the negotiating table (with their US counterparts) with their two major principles being to focus on trade expansion and the protection of local industries vulnerable to the bilateral free trade pact (with the US)," Kim Young-joo, chairman of the Korea International Trade Association, told Yonhap News Agency in a recent interview.

On Jan. 5, the two countries are expected to begin negotiations to make amendments to their five-year-old free trade agreement at the request of the US government last year. 

The move comes as Seoul accepted US President Donald Trump's demand to rewrite terms of the pact he called "horrible," citing rising US trade deficit in the manufacturing sector.

In the upcoming talks, the US is expected to push for a speedier abolition of tariffs on US products and eased regulations on US vehicles, among others, Kim forecast. 

"While stressing the mutual benefits for both countries and their economic players, Seoul needs to agree on any amendments in the deal with a focus on expanding trade with Washington rather than shrinking trade with the world's top superpower," the KITA chairman said.

 As for the agricultural and livestock industry, which has been highlighted as the most vulnerable sector in the trade deal, he urged the Seoul government make it clear that no concessions will be allowed in the renegotiations.

The chairman also mentioned what requests the government should make at the follow-up talks set for early this year to expand exchange in the service sector and investment between South Korea and China.

Kim said that South Korea needs to use the talks to call on China to establish a system to prevent situations like Beijing's "unfair" trade retaliations against Seoul last year over the deployment of the Terminal High Altitude Area Defense System in South Korea.

"While strengthening exchanges in services and investment amid eased bilateral political tensions over the THAAD deployment, the government will have to ask China to ease local regulations on South Korean companies," he said. 

Last year, Beijing carried out economic retaliation against Seoul over the THAAD deployment. South Korean companies such as Hyundai Motor Group were seriously affected.

Beijing explicitly opposed the THAAD deployment in South Korea, arguing that the powerful X-band radar that comes with the missile defense system could be used against it. Seoul and Washington have said the anti-missile system is purely aimed at deterring missiles from North Korea. (Yonhap)