The Shanghai Composite slipped 0.1% to 4,082 on Tuesday, while the Shenzhen Component declined 0.8% to 14,869, partially erasing gains from the previous session as sentiment weakened amid ongoing uncertainty over US–Iran diplomacy. President Trump reviewed Iran’s latest proposal to resolve the protracted standoff but reiterated key “red lines,” notably blocking Tehran from developing nuclear weapons. At the same time, the Strait of Hormuz remained effectively closed, stoking fears of global energy supply disruptions. Technology shares also dragged on the market, with Zhongji Innolight down 3.4% and Eoptolink Technology off 2% after China ordered Meta to unwind its acquisition of Manus AI, highlighting stricter AI oversight and rising concerns about technology leakage. Contemporary Amperex Technology lost 2% to a one-week low after unveiling a $5 billion discounted share placement and signing a three-year sodium-ion battery supply agreement with Beijing HyperStrong.