Diesel markets are facing renewed supply risks as escalating tensions around the Red Sea threaten to disrupt crude flows to European refineries and constrain exports from Asia, George Shaw, Senior Middle Distillates Analyst at Kpler, said in a note on Wednesday.
The fallout from last week's attack on Saudi Arabia's East-West pipeline is adding to concerns over refined-product availability, while reports of potentially canceled Saudi crude loadings for European refiners could further squeeze distillate supplies.
Shaw said that the latest developments are pushing oil markets closer to its "escalation" scenario, with prompt diesel markets already showing stronger support.
Kpler said that European refinery runs could fall by about 200,000 barrels per day from current projections if the situation deteriorates.
The consultancy said that would leave the Mediterranean particularly exposed to a supply squeeze as Middle Eastern barrels become harder to secure, while Asian markets could also face tighter conditions as refiners become more cautious about feedstock availability and exports.
Prompt bullishness for gasoil will remain in place, Shaw said, adding that the Mediterranean is especially vulnerable to a decline in Middle Eastern supply.
The potential cancellation of Saudi crude cargoes would affect refinery slate optimization, with medium-sour crude typically favored to maximize distillate production.
Kpler said that over 800,000 b/d of crude exports from the Red Sea and Sidi Kerir currently head to European and Mediterranean refiners.
European diesel markets are already contending with multiple supply disruptions. Russia has imposed a diesel export ban, while uncertainty around shipping via the Strait of Hormuz has complicated Middle Eastern flows.
Kpler said a briefly reported, unsubstantiated attack on Saudi Aramco's YASREF refinery in Yanbu, a major diesel exporter, also added to market jitters. The refinery exported about 220,000 b/d of diesel to Europe and the Mediterranean in 2025.
However, actual diesel outflows from Yanbu refineries are already down almost 50% from a year earlier.
Kpler said that the decline comes as Red Sea refineries have had to compensate for supply disruptions, including the shutdown of Jizan refinery following a Houthi attack in July, while also meeting more domestic demand.
Meanwhile, escalating attacks and security concerns in the Red Sea could make vessels more reluctant to transit the Bab el-Mandeb Strait, creating an immediate shortfall in cargo arrivals from India into Europe and the Mediterranean.
Kpler said a shift toward longer voyages around the Cape of Good Hope would further delay supplies and could leave the prompt market unexpectedly short of barrels.
Diesel cracks have already climbed to new highs as the global market grapples with limited refining capacity relative to demand. The consultancy said that the latest Red Sea developments add another layer of risk to an already tight market.
For Asian refiners, the damage to Saudi Arabia's East-West pipeline presents a more immediate threat to sentiment because of its implications for crude availability.
Higher Chinese diesel exports have helped ease regional fundamentals and have even enabled cargoes to move toward Europe, widening the spread between East and West markets.
Kpler said that a deterioration in feedstock availability could reverse that trend, with lower Chinese diesel exports in October potentially providing additional support to Singapore gasoil swaps.