FRANKFURT, Germany — The U.S. and the European Union are hitting Russia with another round of sanctions, aiming to cut into oil and gas export earnings that fund Moscow's war against Ukraine.

More than 3 1/2 years into the war, the effort remains a cat-and-mouse game, with Russia finding new ways to get around sanctions, and Washington and Brussels adding new ones and looking for ways to plug enforcement gaps.

The chief target of the latest round: Russia's biggest oil companies, Rosneft and Lukoil. New U.S. Treasury sanctions threaten their customers in India and China with retaliation that could include being sanctioned themselves.

Meanwhile, the EU is phasing out shipments of Russian liquefied natural gas and is going after cryptocurrency issuers, platforms and exchanges that Russia h

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