A massive oil depot fire raging near Russia's Black Sea resort of Sochi has been blamed by Russian authorities on a Ukrainian drone attack. Sochi's nearby airport has suspended flights. Krasnodar Region Governor Veniamin Kondratyev said on Telegram that drone debris hit a fuel tank and 127 firefighters were tackling the blaze.

Ukraine's military said on Saturday that it had struck oil facilities inside Russia, including a major refinery as well as a military airfield for drones and an electronics factory.

More than 120 firefighters were trying to extinguish a blaze at an oil depot in the Russian city of Sochi that was sparked by a Ukrainian drone attack, regional Governor Veniamin Kondratyev said early on Sunday on the Telegram messaging app.

Ukraine's anti-corruption bodies said on Saturday they had uncovered a major graft scheme that procured military drones and signal jamming systems at inflated prices, two days after the agencies' independence was restored following major protests.

Four Ukrainians have been detained in an investigation of "large-scale" government corruption, including a parliament member, two anti-corruption agencies said.

Ukraine’s anti-corruption agencies say they uncovered a major bribery scheme involving inflated military procurement contracts, just two days after lawmakers restored the agencies’ independence follow

The Russian president didn’t directly respond to President Trump’s ultimatum that Moscow halt its offensive by the end of next week or face financial penalties.

Russian President Vladimir Putin said his war goals in Ukraine are unchanged, as he dismissed US pressure for a ceasefire.