MOSCOW, March 12 (Reuters) - Ukraine pounded targets across Russia on Tuesday with at least 25 drones and nine rockets, in a sweeping attack that one Russian official said had triggered a fire at a major refinery in the world's second largest oil exporter.

What was targeted and what do they produce?

NORSI

A fire broke out at Norsi, Russia's fourth largest refinery, after a Ukrainian drone attack, Russian officials said. It is located near the city of Nizhny Novgorod, some 430 km (270 miles) east of Moscow.

Owned by Lukoil, its formal name is Lukoil Nizhegorodnefteorgsintez.

NORSI refines about 15.8 million tonnes of Russian crude a year, or 5.8% of total refined crude, according to industry sources.

It produces about 4.9 million tonnes of gasoline, 11% of Russia's total, 6.4% of diesel fuel, 5.6% of fuel oil and 7.4% of the country's aviation fuel, according to industry sources.

Lukoil said in January that it had halted a unit at the refinery due to an incident.

Industry sources said before the March 12 drone attack that one of two catalytic crackers remains out of action at the plant.

KIRISHI

The governor of the Leningrad region, Alexander Drozdenko, said that a Ukraine drone had been destroyed on the outskirts of Kirishi, which is home to Surgutneftegaz's Kirishinefteorgsintez (KINEF) refinery.

The Kirishi refinery is one of the top two refineries in Russia. It refines about 17.7 million tonnes of Russian crude, or 6.4% of the total, according to industry sources.

It produces about 2.3 million tonnes of gasoline, 5.3% of Russia's total, 7.6% of diesel fuel, 16.3% of fuel oil and 3.4% of the country's aviation fuel, according to industry sources.

(Reporting by Reuters; Writing by Guy Faulconbridge in Moscow; Editing by Mark Trevelyan)