The local pause in fighting started at 3 am in Ukraine to allow an aid mission into the Russian-occupied town of Oleshky in southern Ukraine later this week.
The attack comes as Moscow, which began its offensive Ukraine in 2022, and Kyiv are preparing to relaunch peace negotiations in November under US mediation.
"The goal of these discussions will be to address the issue of ensuring security for both Ukraine and Russia... within the framework of a final agreement, not after some kind of short pause in fightin ...
The change has come at a time of renewed tension between Kyiv and Washington, with US President Donald Trump seeking to bring down global fuel prices by buying Russian diesel and pressuring both sides ...
Dmytro Lytvyn, an advisor to Ukrainian President Volodymyr Zelensky, said the claim was "fake" and that other sites had been hit "but the refineries were not".
