The assessment is based on direct evidence from high-authority primary sources that confirm U.S. government punitive actions against Russia's two largest oil companies, Rosneft and Lukoil.Evidence for sanctions on Rosneft: Source 1, a 2015 Federal Register notice, explicitly documents the addition of fifteen Rosneft subsidiaries to the U.S. government's Entity List. This is a direct form of sanction that restricts exports and other transactions with these entities. Source 9, though a secondary source, corroborates this, mentioning that Rosneft was affected by sanctions.Evidence for sanctions on Lukoil: Source 5 is a 2022 notice from the U.S. Bureau of Industry and Security (BIS) detailing a charging letter and enforcement action against PJSC LUKOIL. This represents a direct, punitive measure by a U.S. government agency for violating export regulations, which falls under the umbrella of sanctions enforcement.Supporting Context: Several other primary sources (2, 3, and 4) establish the broad legal framework and intent of the U.S. government to impose sanctions and prohibitions on Russia's energy sector. These documents provide the legal authority for the specific actions taken against companies like Rosneft and Lukoil.Conclusion: Since there is direct, primary evidence of U.S. government sanctions or enforcement actions against both Rosneft and Lukoil, the statement is highly credible. The probability is not 1.0 because the term "sanctions" can have various specific meanings, and the actions against the two companies (Entity List vs. enforcement action) differ, but they both represent significant punitive measures by the U.S. government.