Donald Trump reportedly urged Ukrainian President Volodymyr Zelenskyy to stop military strikes on Russian oil refineries during a Sunday phone call, citing concerns that the attacks were worsening a global diesel shortage and pushing fuel prices higher. The request adds a new dimension to Trump’s efforts to end the Russia-Ukraine war and follows extensive Ukrainian attacks on Russian energy infrastructure, including a drone operation involving more than 1,600 drones that struck oil refineries in the Moscow region. Trump has also said the strikes severely disrupted Russia’s diesel industry, while Zelensky reported separate Russian attacks in Zaporizhzhia and Kharkiv that killed one woman and injured five people. The latest diplomatic exchange comes as U.S. and global fuel markets face additional pressure from the war with Iran, the effective closure of the Strait of Hormuz and threats to Red Sea shipping by Iran-backed Houthi rebels. Market pricing suggests the call may have increased expectations for a Russia-Ukraine ceasefire and reduced near-term concern about a NATO-Russia clash. Further diplomatic contacts, changes in military activity and diesel-price trends are likely to shape the outlook.