Ukraine's President Volodymyr Zelenskiy said on Wednesday that Russia's largest drone attack overnight on Ukraine showed the need for 'biting' sanctions on Russia and secondary punitive measures against Russian oil.

Ukraine said it struck a Russian air base on Saturday, while Russia continued to attack Ukraine with hundreds of drones overnight as part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

(Reuters) -Russian air defence units downed six Ukrainian drones headed for Moscow on Sunday, mayor Sergei Sobyanin said. Sobyanin, writing on the Telegram messaging app, said specialists were examining fragments of the drones near the Russian capital.