The United States has warned countries that buying oil from Iran could trigger strict sanctions, raising pressure on global energy trade.

US Treasury Secretary Scott Bessent told reporters at the White House that Washington has formally alerted multiple nations about possible penalties. He said any country importing Iranian oil or holding Iranian funds in their banks could face serious restrictions.

Bessent added that the US has already stepped up its actions against Iran by launching what he described as a maritime blockade earlier this week. According to him, the ongoing conflict has now entered its seventh week, increasing tensions in the region and forcing countries to reconsider their trade ties with Tehran.

China, which has historically been the largest buyer of Iranian oil—purchasing more than 80 percent of its exports—is expected to respond to the pressure. US officials believe that Chinese buyers may temporarily suspend purchases as the blockade tightens and financial risks increase.

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In a further move, the US Treasury has also issued warning letters to two Chinese banks. Authorities cautioned that if any transactions involving Iranian funds are traced through their accounts, they too could face sanctions.

The latest warning signals a tougher stance by Washington aimed at isolating Iran economically. Analysts say the move could disrupt global oil markets and strain relations between major economies, especially if China reduces its imports as expected.