China says it will sanction U.S. House Speaker Nancy Pelosi and her immediate family over her visit this week to Taiwan’s capital Taipei. On Wednesday, Pelosi became the most senior U.S. official to visit Taiwan in a quarter-century. Her trip prompted China to launch large-scale military exercises in waters around Taiwan that effectively blockaded the island. Pelosi spoke to reporters earlier today as she wrapped up her tour of Asia in Tokyo, Japan, and after China’s Foreign Ministry called her actions “vicious” and “provocative.”

Speaker Nancy Pelosi: “They will not isolate Taiwan by preventing us to travel there. We’ve had high-level visits, senators in the spring, a bipartisan way, continuing visits, and we will not allow them to isolate Taiwan.”

On Thursday, Pelosi led a delegation of U.S. lawmakers who traveled to South Korea and toured the Demilitarized Zone that divides the Korean Peninsula. Her trip came as the United Nations said in a new report that North Korea has made preparations for a new nuclear weapons test this year, which would be the first such test since it exploded a hydrogen bomb in 2017.