The U.S. Treasury Department allowed a sanctions waiver for Russian seaborne oil shipments to expire at midnight Wednesday, signaling a potential shift in Washington’s approach to enforcing restrictions on Russian energy exports. The waiver had previously permitted certain transactions related to the shipping of Russian oil. While the waiver lapsed, the Biden administration has not yet publicly confirmed whether it will reinstate full enforcement of the sanctions. This lack of immediate clarification has created uncertainty in the oil market. The decision comes as the U.S. and its allies continue to seek ways to limit Russia’s revenue streams following its invasion of Ukraine. Officials have remained tight-lipped regarding the reasoning behind letting the waiver expire and future plans. The move could potentially disrupt global oil supplies and impact prices.