Group 1 - Russia's crude oil production in December 2025 fell to its lowest level in 18 years, with a daily output of 9.326 million barrels, a decrease of 100,000 barrels per day from November [3] - This production level is nearly 250,000 barrels per day lower than the quota set by the OPEC+ agreement [3] Group 2 - Ukraine launched at least 73 attacks on 28 Russian oil producers in 2025, affecting a total refining capacity of 219 million tons per year, which accounts for two-thirds of Russia's total refining capacity [5] - The significant decline in Russia's refining capacity has forced the country to increase crude oil exports, contributing to a continuous drop in oil prices, with current prices around $33 per barrel [5] Group 3 - As a result of sanctions, Russian oil is piling up on tankers at sea, with buyers reluctant to accept these shipments, leading to export difficulties [7] - By the end of December 2025, over 185 million barrels of Russian crude oil were stranded on tankers, unable to find buyers [8] Group 4 - The control of Venezuelan oil by Trump, aimed at dumping it for market share, poses an indirect blow to Russia [10] - The escalating sanctions, attacks on oil infrastructure by Ukraine, and Trump's strategic moves are expected to significantly risk Russia's energy revenues in 2026, further exacerbating economic risks for the country [10]