BEIJING—China established formal relations with El Salvador, wresting away yet another from Taiwan’s diminishing pool of diplomatic partners as part of an intensifying campaign to undermine Taiwanese President Tsai Ing-wen.
Tuesday’s announcement was made at a signing ceremony by the Chinese and Salvadoran foreign ministers in Beijing. It comes on the heels of a trip to Central and South America with unusually high-profile stopoffs in the U.S. by Ms. Tsai, whom China’s leaders want shunned for resisting Chinese appeals for…