US will impose 'toughest sanctions in history' on Iran, Bessent says, urging China to cooperate; oil prices hit three-week high

U.S. Treasury Secretary Scott Bessent announced the imposition of "the toughest sanctions in history" on Iran, urging China to cooperate, while oil prices surged to a three-week high amid escalating tensions. China, however, dismissed sanctions as ineffective in resolving the ongoing conflict.

Nikkei Asia+1 source21 August 2026 · 00:58 UTC
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U.S. Treasury Secretary Scott Bessent declared on Thursday that the U.S. will implement "the toughest sanctions in history" against Iran, aiming to pressure the regime amid ongoing military conflict. Bessent emphasized the sanctions as part of a broader strategy, stating, "It is a one-two punch. We have the blockade (on Iran), and we are going to have the toughest sanctions in history."6

The sanctions come as President Donald Trump warned of severe economic repercussions for any nation aiding Iran, asserting, "ANY country that allows its financial institutions, businesses, airports, or government entities to provide any type of lifeline to Iran will itself face TREMENDOUS Economic Consequences." In response, a spokesperson for China's embassy in Washington criticized the sanctions, claiming, "Regarding the Iran issue, sanctions and pressure do not help resolve the problem." China, which imports over 80% of Iran's oil, is urged by Bessent to align with U.S. efforts, as he noted, "Keep in mind that the Chinese get 50% (of their) energy from inside the Gulf."12

Despite the sanctions, oil prices have surged to a three-week high, with Bessent expressing confusion over the market's reaction, stating, "I'm not sure why oil has popped up on this." He suggested that the economic pressure could prevent a military escalation, asserting, "If we are doing the maximum economic pressure, then that means that likely there will not be a large-scale kinetic restart." Bessent plans to provide further details at a press conference on Monday.3

Key Insight
“China, which buys over 80% of Iran's shipped oil, dismissed sanctions as unhelpful, urging political and diplomatic resolution. Bessent also suggested the economic pressure could reduce the need for large-scale military action, while oil markets reacted with a three-week high.”
Trump administration pressuring countries to cut economic ties with Iran
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Trump administration pressuring countries to cut economic ties with Iran
CuriousCats studied:
1
Nikkei Asia
“(Reuters) -- U.S. Treasury Secretary Scott Bessent on Thursday said Washington will impose "the toughest sanctions in history" on Iran and urged Beijing to cooperate, but China said sanctions will not help in resolving the issue.”
Nikkei Asia →
2
CNACNA
“The US will impose "the toughest sanctions in history" on Iran, Treasury Secretary Scott Bessent said on Thursday (Aug 20), a focus on economic measures he suggested would lessen the need for new major military operations against Tehran.”
CNA →
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