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 visit earlier this week sent planes, ships and missiles menacingly close to this small island democracy for a second day.

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 it will cancel military phone calls between area commanders, defense meetings and international criminal cooperation with the U.S., as well as no longer take part in talks on maritime safety and climate change. 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.”

The unspecified sanctions, China’s latest retaliation for the brief trip to the self-ruling island it claims as its own territory, came as Pelosi vowed not to let Beijing isolate Taiwan while Washington and its allies urged de-escalation.