Some officials in South Korea say agreeing to the pipeline investment might placate the U.S., but Trump is still threatening tariffs.

U.S. President Donald Trump has criticized South Korea for imposing more unfair tariffs on American products than China. The President also criticized the country for issuing subsidies to foreign chipmakers like Samsung Electronics Co.

Japan, South Korea and other countries want to partner with the United States in a "gigantic" natural gas pipeline in Alaska, U.S. President Donald Trump said on Tuesday, claiming they would invest "trillions of dollars each.

China’s foreign ministry spokesman, Lin Jian, warns that China would fight ‘to the bitter end’ in ‘a tariff war, a trade war, or any other kind of war.’

South Korea's acting President Choi Sang-mok on Wednesday ordered a review into the impact of U.S. tariffs on Canada, Mexico and China that came into force this week. Choi also ordered support measures to be prepared for domestic firms operating businesses in those countries and to be ready for consultations with the U.