TAIPEI, Taiwan  — China said Friday it would halt cooperation with the United States on areas including military relations and climate change while imposing sanctions against House Speaker Nancy Pelosi, as Beijing stepped up its retaliation to her Taiwan visit.

The new measures were announced as military drills Beijing launched furiously in the wake of her trip earlier this week sent warplanes, naval ships and missiles menacingly close to this small island democracy despite growing criticism.

The U.S. delegation’s unannounced visit to Taiwan has fueled a mounting crisis, raising fears of conflict in the region and stoking tensions between Washington, its allies and Beijing.