A senior Chinese diplomat on Monday bluntly warned the visiting American deputy secretary of state, Wendy R. Sherman, that the Biden administration’s strategy of pursuing both confrontation and cooperation with Beijing was sure to fail. China’s assistant foreign minister, Xie Feng, told Ms. Sherman that the United States’ “competitive, collaborative and adversarial rhetoric” was a “thinly veiled attempt to contain and suppress China,” according to a summary of Mr. Xie’s comments that the Chinese foreign ministry sent to reporters. Ms. Sherman’s meetings offered the latest gauge of the Biden administration’s strategy of stepping up pressure against the Chinese government on...