Kyiv, July 29: Ukrainian forces hit two of Russia’s biggest oil refineries overnight in its latest long-range strikes, officials said, as Kyiv deepened its economic, military and diplomatic pressure on Moscow. Ukraine’s almost daily long-range drone and missile strikes using domestically developed weapons have battered Russian oil facilities for months. The operation has brought a fuel crisis that is embarrassing the Kremlin more than four years after Russia’s all-out invasion of its neighbour. The refineries have a combined annual production capacity of around 30 million tons of oil, according to Ukraine, and make a vital contribution to Russia’s military effort and its government revenue. Russian online retailer Wildberries, a major supplier likened to Amazon that Ukraine has targeted in recent days, said it evacuated employees from a facility in Ryazan but provided no further details.