TAIPEI, Taiwan—A group of U.S. congressmen arrived in Taiwan on a military plane on Nov. 9, marking the third U.S. delegation to visit the self-ruled island since President Joe Biden took office in January. At the time of writing, it is unclear which lawmakers are in Taiwan and how many of them are there. The surprise visit was first confirmed by Taiwan’s foreign ministry before the Pentagon confirmed it hours later during a briefing. “Congressional delegation visits to Taiwan are fairly routine,” Pentagon spokesperson John Kirby told reporters on Tuesday. “It is not uncommon for them to be transported on U.S. military aircraft.” Kirby described the visit as a “normal practice” by the U.S. government under the Taiwan Relations Act (TRA), a U.S. law that requires Washington to provide the island with military equipment for its self-defense. Currently, Washington and Taipei are not formal diplomatic allies. According to Taiwanese media, …