Ukraine launched its largest drone attack on the Moscow region Sunday, hitting the capital's main oil refinery and a residential building, according to Mayor Sergei Sobyanin. He stated that 450 drones were shot down en route to the capital, describing it as the most massive attack.

The attack comes amid an intensification of strikes by both Russia and Ukraine, with both sides targeting energy, transport, and logistics facilities. The Moscow oil refinery is a significant supplier, providing over a third of the region's fuel, with some of its products destined for the Russian military. Ukrainian officials stated that damaging such facilities "directly undermines the enemy's ability to continue its war of aggression and supply its military formations."

Regional authorities reported that at least two people were killed and 20 injured in the attacks. A 44-year-old woman died in Sofyino after a drone struck a three-story residential building, with five others, including two children, injured. An elderly man was killed in the Orekhovo-Zuevo district when a private house was hit.

Mayor Sobyanin suggested the attack was an attempt to disrupt Russia's ongoing parliamentary election, which was in its third day on Sunday. Meanwhile, Russian state media reported that an election official was among two people killed by a drone attack on a bus in a Moscow-controlled area of Kherson, Ukraine.

Social media platforms saw unverified videos appearing to show explosions in the skies above Moscow and a burning warehouse. The drone strike on the oil refinery reportedly damaged three key units, according to Ukrainian military officials. The refinery's fuel output is crucial for the Moscow region and potentially for Russia's military operations.

Air traffic at Moscow's busiest airports experienced temporary disruptions. Sheremetyevo airport warned of restrictions, and Vnukovo airport halted all arrivals and departures for a period. These restrictions were lifted by Sunday morning, though some flight delays were anticipated.

These events occurred as Ukrainian officials reported that nine people, including three children, were killed in Russian attacks in the Kyiv and Sumy regions on Saturday. This included a mother and her two young children killed in an attack in Fastiv, Kyiv.

The continued targeting of critical infrastructure by both nations highlights the escalating nature of the conflict and its impact on civilian areas and essential resources.