Ukraine has hit a major Moscow oil refinery for the second time in a week, disrupting hundreds of flights at the capital's airports. Russian officials said Thursday that this is one of Ukraine's biggest drone attacks since Russia’s invasion over four years ago. The attack follows Ukrainian President Zelenskyy's coordination call with the U.S. and France, securing further support from the G7 summit. Ukraine aims to cut Moscow’s war revenue by targeting oil facilities. The Russian Defense Ministry claims its air defenses shot down 555 Ukrainian drones overnight. Zelenskyy says the attack is part of efforts to force Putin to negotiate.