**Trump Threatens 25% Tariff on South Korea, Reversing Recent Deal**

President Donald Trump says he will raise U.S. tariffs on South Korean exports. The proposed increase would jump from 15% to 25%. This announcement reverses a major trade agreement. Washington and Seoul had finalized that deal just months ago. The earlier agreement followed tense negotiations. It linked trade terms with security cooperation between the two allies. A tariff is a tax on imports. Higher tariffs make foreign goods more expensive for American buyers. This can hurt the exporting country's sales. The President's statement signals potential new friction. It places a recent diplomatic achievement in doubt.