Russia is dodging a U.S.-led sanction meant to limit its energy revenues by using a fleet of “shadow tankers” to sell oil at higher prices, according to The New York Times.

Led by the U.S., Western countries imposed a $60 per-barrel price cap on Russian oil after the Ukraine war started in February 2022, a policy proponents claimed would severely limit Russia’s ability to generate oil cash while falling sort of imposing onerous costs on developing countries. However, Russia has managed to sell about 70% of its oil sales above the West’s price by utilizing a fleet of “shadow tankers” — vessels that are unregistered or registered in nations that are not party to the price cap agreement — to dodge the restrictions, the NYT reported, citing a new report by the Kyiv School of Economics Institute.

In the first half of 2024, Russia managed to sell about 75 million barrels of oil each month using vessels with an average age of 18 years, according to the NYT. Russia spent about $10 billion to develop its “shadow tanker” fleet.

Ukraine Reportedly Sending Cooks, Mechanics To Frontlines Of War Against Russia As Manpower Problem Grows Worsehttps://t.co/aLDjzZsW9j

— Daily Caller (@DailyCaller) August 18, 2024

Moreover, ships that are a part of the Russian “shadow tanker” fleet or that are subject to sanctions for breaking the price cap carried a record amount of oil and related products in September, according to the NYT. Some of these vessels made deliveries to ports in China and India, buyers that have purchased considerable amounts of Russian oil despite the Western sanctions against Putin’s economy.

Some officials inside the Biden-Harris administration want to see the government take a harder line against the “shadow tanker” fleet to continue to squeeze Putin, but others are in favor of treading lightly out of concern that cracking down could put upward prices on energy prices with a pivotal presidential election looming, according to the NYT. More broadly, policymakers have been especially careful in how they’ve handled Russia’s energy industry given the risks of a hot war between Iran and Israel, which would likely drive prices up.

While the U.S. and allies will continue working on enforcement, Russia is still selling oil at suboptimal prices and spending billions on its “shadow tanker” fleet, meaning that the sanction is still a success even if it is being evaded to some degree, one U.S. official who requested anonymity to speak freely on the subject told the NYT.

The White House and the Department of the Treasury did not respond immediately to requests for comment.