Russia's largest oil refinery, owned by Rosneft, has halted operations for the second time this month following strikes by Ukrainian drones.

The Ryazan Oil Refinery of Rosneft, which ranks among the top five largest in Russia and supplies fuel to the Moscow region, has halted oil processing following a drone attack, reports Reuters citing industry sources.

According to the agency's informants, a fire broke out at the main oil processing unit – AVT-6, which accounts for nearly half of its capacity.

The refinery may partially resume operations in a few days, one of the Reuters sources stated. Another source mentioned that damage assessments are currently underway at the refinery.

The Ryazan refinery has a capacity of 13.7 million tons of oil per year and is the largest among Rosneft's facilities; it has been targeted by UAVs for the second time this month.

The previous attack on February 24 disabled the fuel loading railway ramp, causing the refinery to suspend unloading for 18 days for repairs.

Overall, due to attacks on oil refineries, Russia has lost at least 10% of its refining capacity this year, according to Reuters calculations.

On February 19, following a UAV strike, the production at the Syzran Refinery of Rosneft was suspended.

The Volgograd Refinery of Lukoil – the largest fuel supplier for the Southern Federal District – is operating at only 60% capacity after a drone strike on February 3.

The Astrakhan Refinery of Gazprom, which produces gasoline and diesel fuel for southern regions, continues to remain idle. It was hit on the night of February 4, and repairs may take months, according to Reuters sources.

Last year, due to drone attacks and repair issues, oil refining volumes in Russia fell to a 12-year low of 267 million tons. Exports of oil products dropped by 9% to 113.7 million tons.