MOSCOW, Jan 24 (Reuters) - Ukrainian drones hit a

Russian oil refinery in the city of Ryazan overnight, causing a

fire and damaging equipment at one of Russia's biggest

refineries, four industry sources told Reuters on Friday.

The sources said oil storage at the refinery had been set

ablaze. Among damaged equipment were a railway loading rack and

a hydrotreater unit used to remove impurities from refined

products. Reuters was not immediately able to reach Rosneft

, Russia's large state oil company, which owns the

refinery.

Russia's Defence Ministry said its air defences had repelled

a massive Ukrainian drone attack overnight, intercepting and

destroying 121 drones targeting 13 regions, including Moscow. It

made no mention of casualties or damage.

It said 20 had targeted the Ryazan region, which is

southeast of Moscow.

Ukraine also said it had hit the Ryazan refinery. Andriy

Kovalenko, head of Ukraine's centre for countering

disinformation, described the refinery as one target, along with

the Kremniy plant in Bryansk, which Kyiv says produces

microelectronics for Russian weapons systems.

Channels on the Telegram messaging app posted unverified

videos of what bloggers described as large blazes in Ryazan.

They said an oil storage depot and a power station had been hit.

The industry sources said that the railway loading rack

caught fire after the attack.

"A 20,000-tons reservoir is on fire. Adjacent reservoirs

were also damaged, the loadings have been suspended," a source

said.

Ryazan oil refinery processed 13.1 million metric tons

(262,000 barrels per day), or almost 5% of Russia's total

refining throughput in 2024.

It produced 2.2 million tons of gasoline, 3.4 million tons

of diesel, 4.3 million tons of fuel oil and 1 million of jet

fuel, according to a source-based data.