Ukrainian military officials say three key processing units have been damaged at Moscow's main oil refinery, following what the city's mayor called the most massive drone attack on the capital region to date.

According to Ukraine's defence ministry, the Kapotnya facility supplies more than a third of the Moscow region's fuel, with part of its output supplying the Russian armed forces. Moscow Mayor Sergei Sobyanin said air defences brought down 450 drones heading for the capital, though several broke through to strike the refinery and a residential building near one of the city's boulevards. Mr Sobyanin reported no fatalities within the city limits.

In the wider Moscow region, Governor Andrei Vorobyov said at least two people were killed and 20 injured. A 44-year-old woman died when a drone struck a three-storey residential building in Sofyino, injuring five others including two children. An elderly man died after his home was hit in the Orekhovo-Zuyevo district, and emergency workers evacuated roughly 400 residents from a damaged 21-storey tower block in Ramenskoye.

Transport disruption has begun to ease. Flight restrictions at Vnukovo and Sheremetyevo airports were lifted on Sunday morning, though airport authorities warned passengers that residual flight delays remain.

The strikes came on the final day of Russia's three-day parliamentary elections. Russian state media reported that an election official was one of two people killed on Sunday when a drone struck a bus in a Russian-controlled part of Ukraine's Kherson region. Russian officials have accused Kyiv of attempting to disrupt the ballot, which has been tightly managed by the Kremlin and dismissed by critics as neither free nor fair.

We previously reported that seven people had been killed in Russian attacks across Ukraine on Saturday. Ukrainian officials have since confirmed the death toll has risen to nine, including three children. Regional authorities reported that a mother and two young children died in Fastiv, a child injured in Vyshhorod later died in hospital, and four people were killed in the north-eastern Sumy region.

Ukrainian President Volodymyr Zelensky shared footage of the refinery fire on Telegram, urging Moscow to end the war and noting that proposals regarding energy and food security remain open.

What we don't know yet is the operational capacity remaining at the Kapotnya plant or how quickly the damaged units can be repaired. I'll be tracking official assessments and regional fuel supplies as more information becomes available.