"The United States sending officials to Taiwan under any excuses is in serious violation of the 'one China' principle," Geng Shuang, a Chinese foreign ministry spokesman, said Tuesday. "It interferes with China's internal affairs and negatively impacts China-US relations."
"We urge the US to abide by its pledge to China and correct its mistake to avoid harming China-US relations and peace in the Taiwan Strait."
The American Institute in Taiwan, as the de facto US embassy in Taipei is called, was officially declared open Tuesday morning, in a ceremony attended by senior US diplomats and Taiwan President Tsai Ing-wen.
In an opening address, Assistant US Secretary of State for Educational and Cultural Affairs Marie Royce described the sprawling five-story complex, which cost $255 million to build, as much more than mere bricks and mortar.