Russia fired 597 drones and decoys, along with 26 cruise missiles, into Ukraine overnight into Saturday, Ukraine's air force said.

Putin's army is reportedly just one to two kilometres from Kupyansk, which was liberated in September 2022 by Ukrainian forces during their counteroffensive.

In addition to the back-to-back, mammoth overnight strikes, other Russian attacks killed at least 21 civilians across Ukraine on July 7-10. In eastern Donetsk oblast, or region, Russian artillery shelling and drone attacks resulted in 15 civilians deaths,

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Russia launched its largest drone and missile bombardment of Ukraine overnight into Wednesday, according to Ukrainian President Volodymyr Zelenskyy.

In a statement on the Telegram messaging app, the SBU said it believed agents of the Russia's Federal Security Service (FSB) had been behind the killing of SBU colonel Ivan Voronych in Kyiv on Thursday and that it had tried to detain them on Sunday.

Kyiv says two people accused of working for Russia and shooting dead a Ukrainian intelligence officer were killed.