Diesel and refining margins stand to react more than flat crude. A US push to curb Ukraine's refinery strikes would, if Kyiv agrees, ease one upside risk to product supply, while continued attacks such as Sunday's hit on a Moscow refinery keep the risk premium in place. That makes Tuesday's meeting a headline risk for the diesel complex, with the direction depending on any signal from Kyiv on strike policy. Traders are unlikely to price a change of course until Ukraine says so publicly, given that the request rests on a single unnamed source.--Diesel was reportedly a recurring theme in Trump's call with Zelensky, as Kyiv's refinery campaign collides with Washington's push to cool fuel prices and revive talks.Summary:A source familiar with Sunday's call told Axios that President Donald Trump repeatedly asked Ukrainian President Volodymyr Zelensky to stop attacking Russian oil refineries, because the strikes are driving up global diesel prices.Zelensky said the two will meet on the sidelines of the UN General Assembly in New York, with the meeting expected on Tuesday, and that Ukraine is ready to take serious steps toward a de-escalation deal with Russia.The White House is trying to broker an agreement under which Russia and Ukraine take reciprocal steps to de-escalate and resume negotiations, days after Trump signed a Russia sanctions bill and approved the largest US arms deal with Ukraine since he took office.Ukraine's chief negotiator Rustem Umerov said stumbling blocks in the talks have fallen from dozens to essentially one or two key issues, and dismissed a Kyiv Independent report of Ukrainian frustration with envoy Steve Witkoff as false.Fighting has intensified. Ukraine fired missiles at Moscow on Sunday and hit an oil refinery, while Russia has struck Kyiv and other major cities almost daily in recent weeks.Russia has signaled willingness to consider de-escalation steps ahead of winter and a return to trilateral talks, but there has been little progress toward a deal.US President Donald Trump repeatedly asked Ukrainian President Volodymyr Zelensky to stop attacking Russian oil refineries during a phone call on Sunday, according to a source familiar with the call cited by Axios. The source said the strikes are pushing up global diesel prices, and that the subject came up many times in the conversation.Zelensky said after the call that the two leaders will meet on the sidelines of the UN General Assembly in New York, with the meeting expected on Tuesday. Writing on X, he called it an important conversation and said the meeting could change a lot, adding that there is diplomatic momentum and that Ukraine is ready to take serious steps toward a de-escalation deal with Russia. Rustem Umerov, Zelensky's chief negotiator and the head of Ukraine's Foreign Intelligence Service, told Axios he has spent recent days working with White House envoys to organize the meeting.The meeting follows Trump's decision several days ago to sign a Russia sanctions bill and approve the largest US arms deal with Ukraine since he took office, two steps Kyiv had sought for months. The White House is working to broker an agreement under which Russia and Ukraine would take reciprocal steps to de-escalate and resume negotiations. Umerov said significant progress has been made, with the number of stumbling blocks cut from dozens to essentially one or two key issues, and described the trend as positive. He also called a Kyiv Independent report of growing Ukrainian frustration with US envoy Steve Witkoff false, saying he has worked with Witkoff and Trump adviser Jared Kushner daily for the past year.Battlefield activity has moved in the opposite direction. Ukraine launched a missile attack on Moscow on Sunday and hit an oil refinery, while Russia has fired missiles at Kyiv and other major cities almost daily in recent weeks. Russia has signaled it is willing to consider de-escalation steps ahead of winter and a resumption of trilateral talks with the United States and Ukraine, although there has been little progress toward an actual deal.For oil markets, the point to watch from Tuesday's meeting is whether Kyiv signals any change in its approach to refinery strikes. The account of Trump's request rests on one unnamed source, and neither government has publicly said whether Ukraine will alter its targeting. This article was written by Eamonn Sheridan at investinglive.com.