Washington, Feb. 11 -- US President Donald Trump has announced plans to impose 25 per cent tariffs on all steel and aluminum imports coming into the United States "without exceptions or exemptions," raising concerns over its ramifications on South Korean and other exporters. Trump signed two proclamations regarding the sweeping tariffs, while affirming a plan to announce "reciprocal" tariffs "over the next two days" -- duties on U.S. imports designed to match tariff rates that other countries impose on U.S. exports, reports Yonhap news agency.

During his first term, Trump imposed a 25 per cent tariff on steel imports and 10 per cent on aluminium imports on national security grounds. The new measures will remove exceptions, exemptions and...