Strategic ambiguity toward the defense of Taiwan has long been U.S. policy, yet President Biden has now said—four times—that he's willing to get militarily involved to defend the country. Read ‘Review & Outlook’ editorials: https://www.wsj.com/news/author/editorial-board Subscribe to WSJ Opinion: https://bit.ly/3PovNsz More from WSJ Opinion: On site: https://www.wsj.com/news/opinion On Twitter: https://twitter.com/WSJopinion On Facebook: https://www.facebook.com/WSJOpinion #ReviewAndOutlook #WSJOpinion #WSJ Images: AFP/Getty Images/Shutterstock Composite: Mark Kelly (05/26/22)