US sanctions against Russia's two largest energy companies, the state-owned Rosneft and privately held Lukoil, are perhaps the most significant economic measures imposed by the West since the invasion of Ukraine.

If fully implemented, they have the potential to significantly choke off the flow of fossil fuel revenue that funds Russia's war machine, but their power lies not in directly denying Russia access to the tankers, ports and refineries that make the oil trade turn, but the US financial system that greases the wheels.

Ever since the invasion, the Russian government has proved masterful at evading sanctions, aided and abetted by allies of economic convenience and an oil industry with decades of experience.

Ukraine war latest: Zelenskyy expresses relief at Trump move

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