These companies manage over 100 oil tankers capable of handling nearly all the oil exports from Russian European ports such as Primorsk, Ust-Luga, and Novorossiysk, amounting to approximately 10 million tons per month or 2.4 million barrels per day. One trader informed Reuters that the "shadow fleet" may prove insufficient to transport all Russian oil. U.S. sanctions against the Russian oil industry U.S. Treasury Secretary Janet Yellen recently stated that Washington is preparing to take stringent measures for violating the established price ceiling on oil. According to Reuters, the U.S. Treasury Department has requested information from shipping companies in about 30 countries regarding approximately a hundred vessels suspected of transporting Russian oil above the price ceiling. Recently, Reuters reported that the price of the primary Russian export grade of oil, Urals, has returned to the sanctioned level set by the G7 countries at $60 per barrel.