China’s exports to developing markets have soared, opening indirect routes to the U.S. market that officials in Beijing worry may be closed under pressure from President Trump.

New 25% trade tariffs on goods from Canada and Mexico went into effect early Tuesday after President Donald Trump declined to extend a 30-day pause in a move the president says aims to quell the flow of illegal drugs like fentanyl into the U.S. The new assessments also include a 10% tariff on Canadian energy products.

President Trump on Thursday said he will pause 25% tariffs on U.S. imports from Mexico and Canada that are covered under a 2020 trade agreement, delaying levies imposed on the nations earlier this week.