Ukrainian forces have continued to attack targets deep inside Russia with drones, including more facilities belonging to the country's largest online retailer, Wildberries, as President Volodymyr Zelenskyy urged the United States and European allies to bolster Ukraine's air defenses amid escalating Russian ballistic missile attacks.According to monitoring Telegram channels and Russian regional authorities, Ukrainian drones struck a Wildberries logistics center and an oil refinery in Russia's Volgograd region on July 31.Wildberries, Russia's equivalent of online retail giant Amazon, confirmed reports of a fire at its warehouse in the Volgograd region.According to the company's preliminary information, no one was injured during the attack.Telegram channels also reported an attack on a Wildberries logistics facility in Zelenodolsk in Russia's Republic of Tatarstan.According to videos published online, the strike caused minor smoke, but no large-scale fire broke out.Local residents also reported explosions in Kazan, the capital of Russia's oil-rich Republic of Tatarstan, while the republic's authorities said temporary restrictions had been imposed at airports in the region amid a drone alert, later adding no damage or casualties had been reported.