For decades, the U.S. has walked a careful line when it comes to Taiwan — vowing to protect the island from China, without saying exactly how far it would go to do that.On Monday, that appeared to change.Guest: David E. Sanger, a White House and national security correspondent for The New York Times.Want more from The Daily? For one big idea on the news each week from our team, subscribe to our newsletter. Background reading: President Biden’s seemingly offhand remarks about Taiwan, made during his visit to Asia, caught some of his staff by surprise.The Russian invasion of Ukraine has been closely watched by those in Taiwan who feel that their island faces a similar threat from Beijing.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.