I'm compiling information on the losses right now. I will make a follow-up post shortly.

Belaya Airbase, Irkutsk Oblast. Over 4,400km from Ukraine.

All aircraft from Engels-2 Airbase have taken off in order to escape Ukrainian UAVs.

Sirens are sounding in Engels District, Saratov Oblast.

4 unidentified missiles in the direction of Terny, Sumy Oblast.

They were all S-400s.

The SBU claims responsibility for the attacks on Russia's Airbases, stating that Olenya, Ivanovo Severny, Diaghilev and Belaya Airbases were hit.

The strikes were dubbed "Operation Web".

So far I can confirm Ukraine has hit:
3 Tu-95Ms strategic bombers
2 Tu-22M3 strategic bombers
1 An-12 Military transport aircraft

Fighterbomber confirms that 4 Russian long-range Airbases have been hit in the last 2 hours. These will be Olenya, Ivanovo Severny, Diaghilev and Belaya Airbases.

3 more FPV drone impacts have been recorded at Belaya Airbase in Irkutsk Oblast, bringing the total to 5. Tu-160 strategic bombers were previously stationed at the impact sites.

Strong explosion in Severomorsk, Murmansk Oblast. This city is home to nuclear powered submarines.

Edit: This video is from Olenya Airbase

Footage shows a Ukrainian FPV drone taking off from a truck near Belaya Airbase in Irkutsk Oblast.

That same truck is now on fire.

Probably some sort of self-destruction mechanism.

The driver of one of the trucks which launched FPV drones has been strangled to death.

Unconfirmed reports state that 3 Tu-95MS strategic bombers stationed at Belaya Airbase in Irkutsk Oblast have been hit by FPV drones.

Zelensky announces that the Ukrainian delegation that will head to Istanbul tomorrow will be led by Ukrainian defence minister Umerov.

Russian sources confirm that the Russian delegation is now flying to Istanbul.

The head of Severomorsk Vladimir Evmenkov states that the reports of explosions in Severomorsk are false. He claimed the situation is stable and that there are no threats.

Video is from Olenya Airbase, not Severomorsk.

I love the difference between Pro-Russians and Pro-Ukrainians when it comes to stuff like this.

Pro-Russians will begin saying Russia needs to remove Putin or capitulate with this situation, however if Ukraine lost every single aircraft in their airforce Pro-Ukrainians would somehow manage to downplay it into insignificance.