TOKYO -- Asian economies are set to use imports of U.S. energy resources as leverage in negotiations with U.S. President Donald Trump to back down from his hefty "reciprocal" tariffs, but concessions in other areas like automobiles and agriculture could prove harder, observers say. "Asian trading partners have been the most forthcoming in terms of doing the deals," Scott Bessent, the U.S. Treasury Secretary and Trump's chief tariff negotiator, said on Tuesday, singling out India, South Korea and Japan.