Trump Announces Broad U.S. Sanctions, Declares Economic War on Iran

Washington, D.C., – On Thursday, President Donald Trump declared the launch of an “economic war” against the Islamic Republic of Iran, unveiling a sweeping package of sanctions that will target any nation or company that continues to trade with Tehran. The executive order, signed at the White House, expands existing penalties to include secondary sanctions on banks, shipping firms and oil purchasers that facilitate Iranian commerce, and it authorises the Treasury Department to freeze assets and bar access to the U.S. financial system for violators. The move marks the most aggressive unilateral economic pressure on Iran since the 2015 nuclear agreement was abandoned.

The president’s authority to impose such measures derives from the broad executive powers vested in the office by the Constitution and reinforced by a series of statutes, most notably the International Emergency Economic Powers Act. Over the past century, the role of the U.S. chief executive has evolved from a relatively limited domestic administrator to a global policymaker whose decisions can reshape international markets and diplomatic alignments. In recent decades, presidents have routinely used economic levers—sanctions, trade restrictions and asset freezes—to advance foreign‑policy objectives, a practice that President Trump has now intensified against Tehran.

Washington’s justification for the new sanctions rests on Tehran’s alleged violations of United Nations resolutions, its continued enrichment of uranium, and its support for proxy militias across the Middle East. Administration officials argue that cutting off Iran’s ability to sell oil and access the global financial system will cripple its economy and force a return to the negotiating table. Critics in Congress and among allies warn that the policy could destabilise an already volatile region, push Iran closer to China and Russia, and undermine the fragile balance achieved by the 2015 Joint Comprehensive Plan of Action, even though the United States withdrew from that deal in 2018.

Iran’s foreign ministry responded within hours, denouncing the United States’ declaration as “unlawful aggression” and vowing “swift and decisive retaliation.” Tehran warned that it would seek alternative trading partners, deepen ties with the Eurasian Economic Union, and consider counter‑measures that could affect the shipping lanes of the Strait of Hormuz. Regional actors, including Saudi Arabia and the United Arab Emirates, have expressed tacit support for the U.S. stance, viewing Iran as a destabilising force, while European nations have cautioned against a unilateral escalation that could disrupt global oil supplies and exacerbate inflationary pressures worldwide.

The ramifications of an intensified U.S.‑Iran economic confrontation extend beyond the Middle East. Heightened sanctions risk curtailing Iran’s oil exports, which could tighten global crude markets and push prices upward, affecting energy‑intensive economies across Asia, including Taiwan. Higher oil costs translate into increased manufacturing expenses, potentially squeezing the margins of Taiwan’s semiconductor and electronics sectors that already operate on thin profit lines. Moreover, any disruption to maritime traffic in the Persian Gulf may reverberate through the broader supply chain, prompting firms to reassess logistics and risk management strategies. For the region, the escalation underscores how U.S. presidential actions—rooted in expansive executive authority—continue to shape geopolitical and economic landscapes far beyond American borders.