Ukraine has attacked two major oil refineries far inside Russian territory, targeting the Bashneft-Novoil facility in the Bashkortostan republic (roughly 1,300km from the Ukrainian border) and the Slavneft-Yanos refinery in the Yaroslavl region, some 700km away. President Volodymyr Zelensky said the strikes were intended to reduce the oil revenues Russia uses to finance its war, and also reported hits on military patrol boats and so-called "shadow fleet" tankers used to export sanctioned Russian oil in the Black Sea. The attacks come as both sides intensify strikes on energy and infrastructure targets, with Russia killing at least 11 people across Ukraine overnight and leaving the southern city of Kherson without electricity, even as front lines remain largely unchanged and diplomatic efforts to end the conflict have yet to produce results.