Ufff... I don’t know whether this was the largest attack on Russian territory in the entire war or not...

Ufff... I don’t know whether this was the largest attack on Russian territory in the entire war or not. But a fact is a fact: at least five sites were hit with varying degrees of damage (maybe OSINT people will spot something else later in satellite imagery), including two oil refineries.

1 - Yaroslavl oil refinery, aka "Slavneft-YANOS." The fire location has been identified, it is the AVT-3 unit, - Dnipro Osint. The last strike on Yaroslavl was on April 26, making this the fifth successful hit in total.

2-5 - Rostov-on-Don, Western industrial hub, overnight and in the morning. Two fire hotspots: the first near the Empils paint and varnish plant, the second near the Radar Scientific and Technical Center, - geolocation by ASTRA. Satellite imagery is needed to assess the consequences.

6 - Rostov-on-Don, more video from the Western industrial hub, TD "Elektrotekhmontazh" burned down and suspended operations, - ASTRA.

+ (Not in the video) A UAV hit the administrative building of "Air Navigation of the South of Russia." Operations at 13 airports were suspended. A NOTAM was issued closing the airspace over southern Russia through May 12 inclusive. Later, the Russian Transport Ministry reported that this period might be shortened and air service would partially resume from 15:00; the NOTAM was canceled.

7-8 - Perm oil refinery, aka PNOS. The AVT-5 unit is on fire, eyewitness photos plus a satellite image. Analysis: Dnipro Osint. The results of yesterday’s strike were also уточнены - the AVT-2 unit and two tanks were damaged. Third successful hit.

9 - Khankala, Chechnya, a building on the territory of the military base and headquarters of the 42nd Guards Motor Rifle Division. Geolocation: Exilenova+ and ASTRA.

10 - Grozny, Chechnya, the building of the local FSB directorate. One drone did not make it, and the second hit the target. Geolocation: ASTRA.

Video: Exilenova+, Supernova+, ASTRA