According to recent reporting, the major Russian refineries still described as undamaged were the Omsk oil refinery and the Angarsk petrochemical company in Irkutsk region, both far east of the Ural Mountains.

Quick Scoop

A late-June report said nearly all of Russia’s top-10 refineries had been hit, with only those two still remaining undamaged at that time. However, the situation changed on July 6, 2026, when reports said drones struck the Omsk refinery, which means Omsk no longer appears to be untouched now.

What that means

That leaves Angarsk as the clearest major refinery still described as not damaged in the latest material I found. A separate June 20 report also said a drone attack on the Tyumen oil refinery was repelled with no damage reported, but that was about an attempted strike, not a confirmed hit.

Bottom line

  • Previously undamaged major refineries: Omsk and Angarsk.
  • As of July 6, 2026: Omsk appears to have been hit, so Angarsk is the main major refinery still reported as undamaged.
  • Tyumen: an attack was reported as repelled, with no damage confirmed.

TL;DR: the best current answer is Angarsk , with Tyumen mentioned only as a refinery that reportedly avoided damage in a repelled attack.