Ukraine continues to cripple Russia's energy sector by hitting numerous oil refineries, depots, chemical plants, and more with drones.

Ukraine launched its "most massive" attack against Russian military and industrial facilities in a range of up to 1,100 kilometers (620 miles) overnight on Jan. 14, the General Staff of Ukraine’s Armed Forces reported.

Ukraine launched waves of long-range strikes, including its ATACMS and Storm Shadow missiles, at targets inside Russia.

Ukrainian drones struck deep inside Russia in an overnight attack targeting an oil facility serving a military airfield in the city of Engels, nearly 400 miles from the border, Ukraine’s military said Wednesday.

While air raid sirens during visits by foreign leaders have sounded before, it is rare for air defenses to actually have to fight off attacking drones.

The barrage appeared to be one of the largest recent assaults in Ukraine’s campaign to damage Russia’s war machine on its home territory.

The Russian Defense Ministry said that Ukraine launched six ATACMS missiles overnight at the Bryansk region, but that all of them were downed by air defenses. The ministry also said that 146 Ukrainian drones had been shot down outside the conflict zone over the last day.

Located in Saratov Oblast, over 750 kilometers from the Ukrainian border, Engels airbase is home to Russian heavy bombers.

At least four people have been killed in a Russian drone and missile attack on the Ukrainian capital. Timur Tkachenko, head of Kyiv’s military administration, said the attack at dawn on Saturday took place in the city’s centrally located Shevchenkivskyi district.

( MENAFN - UkrinForm) Ukrainian drones hit at least two fuel tanks at the Saratov refinery in Russia. This is evidenced by Planet Labs satellite images taken on January 14, available to radio Liberty's Schemes project, Ukrinform reports.

Officials in several Russian regions, some hundreds of kilometres from the border, reported strikes overnight.