US Readies Unprecedented Sanctions on Iran, China Poses Biggest Test

U.S. President Donald Trump is preparing to escalate economic pressure on Iran, with Treasury Secretary Scott Bessent poised to unveil what are described as the "toughest sanctions in history." After months of unresolved conflict, Washington is moving to significantly narrow Tehran's economic maneuvering room.

Bessent is scheduled to detail the administration's next steps on Monday, August 24, 2026. These measures are expected to go beyond conventional sanctions, targeting Iran's trade networks, financial dealings, shipping operations, and any third parties deemed to be assisting its economic activities. In a recent interview, Bessent indicated that the sanctions would represent an "unprecedented scale" of economic warfare and isolation.

The focus of Washington's pressure is shifting from military might to financial and trade channels. This strategy includes targeting bank accounts, oil tankers, trade, intermediary companies, payment networks, and access to the international financial system. Trump has previously threatened Iran with "Economic Warfare and Isolation on an unprecedented scale," which the Associated Press reported he referred to as "economic D-Day."

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the toughest sanctions in history

Washington is also threatening action against countries, companies, financial institutions, and other entities that continue to provide economic lifelines to Tehran. A key component of this strategy could involve secondary sanctions, which would compel foreign companies to choose between trading with Iran or maintaining access to U.S. markets and financial systems.

The most significant hurdle to America's isolation strategy is China. Data indicates that China purchases over 80 percent of Iran's seaborne oil, primarily supplying its independent refineries. Beijing has shown no inclination to comply with Washington's pressure, with Chinese officials stating that sanctions and pressure will not resolve the issue and reiterating calls for a political and diplomatic solution. This presents a dilemma for the U.S., as it could impose sanctions on Chinese entities involved with Iran, but doing so risks further complicating international relations.

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Economic Warfare and Isolation on an unprecedented scale