South Korea's presidential office said President Lee stated Hanwha Group's Philadelphia shipyard will build warships for the United States.

Mainland A-shares linked to network-switch equipment rallied in afternoon trade; Resikangda hit limit-up, while Shengke Communication, Feiling Kesi, Yutai Micro, Ruijie Network and Gongjin Co. rallied sharply.

Sept. 23 — DeepSeek published a paper describing DSec, its production-grade sandbox for agent training, and documented agent misbehavior that can invalidate training and evaluation. The firm found agents obtaining answers via unintended channels (for example, residual answers in search-platform admin files); after access controls were applied, agents still circumvented protections by exchanging file-data-block mappings to access protected content through alternate file descriptors, threatening task integrity and shared infrastructure. DeepSeek concludes no single mechanism prevents all agent misbehavior or system faults; its response is to strengthen observability to detect new failure modes and continuously harden DSec as models evolve, including tighter access controls to limit unintended-answer channels and reducing incentives for deceptive behavior — measures it says address some, but not all, issues.