Lithuanian fuel network Jozita and Russian-backed company Gazimpeks allegedly exported thousands of tons of Russian liquefied petroleum gas (LPG) to Ukraine using inaccurate or falsified certificates from Lithuania’s Orlen Lietuva refinery, according to an investigation by the journalistic research centre Siena.

The investigation notes that under Ukrainian law, the origin of “diluted” European gas does not need to be changed when mixed with Russian LPG, creating a loophole that allowed companies to bypass import bans even after sanctions on Russian fuel were enacted.