Across the long arc of American engagement in Asia, few questions have carried more weight than the security of Taiwan — and now that question has arrived again at the desk of a president known for rewriting the terms of inherited commitments. Beijing is pressing President Trump to block a proposed $14 billion arms package to Taiwan, framing the sale as a test of diplomatic goodwill, while Taiwan and its advocates argue that a secure island serves American strategic interests as much as Taiwanese ones. The decision, expected in the coming weeks, will reveal whether this administration treats d