The global diesel market faces increasing precariousness due to the Russia-Ukraine war and the Iran crisis, tightening supply from multiple directions. Diesel price fluctuations significantly impact economies, affecting shipping and construction costs globally. The average U.S. price for diesel has risen to $5.32 per gallon, a substantial increase from a year ago. A new S&P Global Energy analysis highlights a "big squeeze" in global refined product markets, with worldwide refineries processing 7.5 million barrels per day less crude last month compared to 2025. Renewed hostilities in the Strait of Hormuz further restrict supply, while Middle East refineries operate at reduced capacity due to various impairments. Russia's diesel export restrictions, following Ukrainian drone strikes, have removed 10% of seaborne supplies, and China's refinery activity remains subdued. In July, diesel exports from Russia, the Middle East, and Asia were 1.3 million barrels per day lower year-over-year, impacting about 20% of global seaborne trade. The U.S. Energy Information Administration has revised its diesel price estimates upward, forecasting retail prices to average $4.85 per gallon in 2026. Fuel costs represent a significant portion of trucking companies' operating expenses in the U.S., exacerbating economic pressures. With U.S. refineries operating near capacity and hurricane season approaching, market buffers are thin, raising concerns for potential price increases this winter. The tight diesel market is expected to persist, as ongoing conflicts continue to restrict supply, making it a critical issue to watch.