President Donald Trump announced a new set of sanctions aimed at any country that conducts business with Iran, describing the measure as an "economic D‑Day" and saying the Treasury Department will use its full authority to enforce the penalties. The sanctions build on a long‑standing U.S. embargo that has been in place since the early years of the Islamic Republic in 1979 and were intensified after the 2015 withdrawal from the Joint Comprehensive Plan of Action. The current initiative, called Operation Economic Fury, combines Treasury‑coordinated sanctions on Iranian financial flows with a naval blockade of Iranian ports, and Treasury Secretary Scott Bessent said the specifics will be disclosed at a news conference on August 24. Vice President JD Vance described the sanctions as a new phase of the conflict, saying economic pressure is the United States’ most effective tool. Treasury officials indicated they are prepared to target third‑party nations, including allies such as Turkey and Iraq and major economies like China, that facilitate transactions with Iran. Experts noted that the campaign expands the reach of secondary sanctions to entities that handle dollar‑denominated transactions linked to Iran, a tactic that has not been fully tested. Geostrategy expert Imran Bayoumi of the Atlantic Council said the announcement reflected frustration that previous diplomatic and military approaches have not produced a resolution, while sanctions specialist Michael Parker of the former Office of Foreign Assets Control said the strategy may seek to increase the “economic blast radius” by focusing on third‑country actors. London Stock Exchange manager Mohammed Hammouda observed that Iran has repeatedly found new channels, such as unregistered vessels and commercial fronts, to evade restrictions, making enforcement difficult. The effectiveness of the measures will depend on how targeted countries respond, and whether they are willing to comply with U.S. policy objectives or face secondary sanctions on dollar‑based trade; analysts say the lack of a clear strategic outline leaves uncertainty about the long‑term impact.