Treasury executed "Operation Economic Outcast" Monday, Aug. 24, designating more than 60 entities, individuals, and vessels tied to China, the UAE, Singapore, Turkey, and Greece under sanctions targeting shipping, oil-revenue, gold, aviation, and crypto networks that sustain Iran's oil trade. The action moves Bessent's "Economic D-Day" campaign from announcement to enforced blocking status for the first time since Aug. 7. No major Chinese bank was named; Bessent says that designation is still coming "by end of week," the move that would test Beijing's reciprocal-countermeasures threat.

Iran's Persian Gulf Shipping Administration answered with a formal blacklist naming 46 "non-compliant" vessels, 21 Liberia-flagged and 7 Marshall Islands-flagged among 17 flag states, warning of fines, detention, or seizure for any listed vessel or any vessel that conducts ship-to-ship transfers with one. It is the operational mechanism behind the seizure threat Iran issued Monday.

Separately, UKMTO confirmed two tanker incidents in the past 24 hours: the Saudi VLCC Amzan struck by what Houthis claim was an anti-ship ballistic missile off Yanbu, and the Liberian-flagged Metro Venetian disabled by an unidentified projectile near Oman's coast. Both crews are reported safe. Neither attack has been formally attributed.

Brent and WTI both extended their pullback, a third straight down session.

Watch: whether Iran detains a vessel from its named list, and whether Washington names a Chinese bank this week.