Chinese President Xi Jinping has used his first call with Donald Trump since Trump’s return to office to warn that U.S. arms sales to Taiwan are approaching a red line for Beijing. Xi urged Trump to be “prudent” and insisted that Washington’s moves on Taiwan will be “closely watched” and carry “serious consequences,” underscoring that Taiwan remains the most sensitive and volatile issue in U.S.–China relations, as reported by The Guardian. At the same time, the United States has begun delivering land‑based Harpoon anti‑ship missile systems to Taiwan, with convoys of launcher trucks, radar vehicles and command‑and‑control units arriving on the island, giving Taipei a more mobile coastal defense network built on HEMTT‑mounted launchers.