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.

A site hosting Iranian drones was among facilities struck overnight by Ukraine, according to its General Staff.

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.

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.

Despite President Trump’s demands that Russia halt attacks on Ukraine soon, Putin still believes time is on his side.

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