The fast-moving events have forced President Biden to manage potentially volatile confrontations between the United States and two other world powers. During Qin’s meeting at the White House, he spoke with Kurt Campbell, coordinator for Indo-Pacific affairs on the National Security Council, officials said. Qin, the ambassador, charged in a column published in The Washington Post that Pelosi’s visit to Taiwan was a willfully provocative act. The White House had sought to de-escalate tensions with China ahead of and during Pelosi’s visit, which the speaker undertook against the administration’s wishes. “Beijing’s decision to suspend and halt numerous bilateral dialogue channels is extremely unhelpful.”She added: “At this moment, the United States is showing restraint.