WASHINGTON — Treasury Secretary Janet L. Yellen on Thursday called for a “constructive” and “healthy” economic relationship between the United States and China, one in which the two nations work together to confront challenges like climate change.Ms. Yellen’s comments, which were delivered at Johns Hopkins University’s School of Advanced International Studies, struck a notably positive tone about the U.S.-China relationship following months of heightened tensions between the world’s two largest economies. Ms. Yellen stressed the importance of securing American national security interests, as well as of protecting human rights. She also emphasized that targeted actions the United States has taken against China — like cutting it off from the world’s most advanced semiconductors — are aimed purely at protecting U.S. national …
