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.

Beijing said Friday it will cancel phone calls between regional military commanders, defense meetings, talks on maritime safety and on climate change. It also said it would end cooperation with the U.S. on anti-drug efforts, returning illegal immigrants and transnational crime. Earlier, China took personal action against Pelosi, announcing sanctions on the speaker and her immediate family in response to what the Chinese Foreign Ministry called her “egregious provocations.”