China cuts off vital US contacts over Pelosi Taiwan visit

China cut off contacts with the United States on vital issues Friday — including military matters and crucial climate cooperation — as concerns rose that the Communist government’s hostile reaction to House Speaker Nancy Pelosi’s Taiwan visit could signal a lasting, more aggressive approach toward its U.S. rival and the self-ruled island.

China’s move to freeze key lines of communication compounded the worsening of relations from Pelosi’s visit and from the Chinese response with military exercises off Taiwan, including firing missiles that splashed down in surrounding waters.

After the White House summoned...