Russian claim Ukraine soldiers bombing oil deport. Some clips appeared to show rockets hitting the oil depot. Ukraine's top security official, however, denied Ukrainian forces were behind the attack.
"For some reason, they are saying we are behind it. This does not correspond to reality," security council secretary Oleksiy Danilov said.
Ukrainian aircraft have not struck targets in Russia previously.
Yet Belgorod governor Vyacheslav Gladkov accused Ukraine of launching the attack, and later Russian defence ministry spokesman Igor Konashenkov gave details.
While claims like these are being made. Russia is still demand payment for oil to be paid in Rubles instead of normal currency since the sanctions cut the banks and refuses to give oil until payments are made in rubles only and nothing else. A type of blackmail to the world.
Back to oil deport bombing. The city of 370,000 lies just north of Ukraine's second city Kharkiv, which has been heavily shelled by Russian artillery and remains surrounded by Russian forces.
Governor Gladkov said in a Telegram message that nobody was killed at the oil depot, which is run by Russian state oil firm Rosneft. He said emergency workers were trying to contain the fire and there was "no threat" to residents. The emergencies ministry posted video of the blaze on Telegram.
Russia's Interfax news agency reported that residents nearby were evacuated and two people were injured at the depot. It said eight fuel tanks were on fire and nearly 200 firefighters were on the scene.
Queues of cars later formed at local petrol stations, but Mr Gladkov said Belgorod's fuel supplies were still plentiful.
Russia's RIA Novosti news agency says the blaze in three of the tanks has been extinguished, but there is still a risk of the fire spreading.
On 29 March several explosions were reported at an ammunition depot near Belgorod.
Commenting on the oil depot blaze, Ukrainian defence ministry spokesman Oleksandr Motuzyanyk said Russian "aggression" was being resisted "on the territory of Ukraine".
"It does not mean that Ukraine has to bear responsibility for all those catastrophes and all those events that happen on the territory of the Russian Federation. This is not the first time we have seen such accusations. So, dear friends, I will neither confirm nor deny this information," he said.
Ukraine is yet to claim responsibility for this attack, but if it were confirmed it would be the first time that Ukrainian aircraft have flown into Russian airspace to hit a target. bringing the war home to Russia.
Ukrainian helicopter pilots have plenty of experience of flying low and fast to avoid being detected by military radar and air defence systems.
They've been doing exactly that in the Donbas region in eastern Ukraine for years. I experienced and witnessed the extraordinary skills of the Ukrainian military pilots in 2018 - flying barely metres above the tree line and telegraph poles.
But if these unconfirmed reports are correct - flying at night, well into Russian territory, to launch an attack on an enemy fuel depot would have required extraordinary bravery - as well as finely-honed flying skills.
Low-flying helicopters are still vulnerable to short-range air defence systems. Flying at night would have lessened that risk, but heightened the danger of hitting an object near the ground.
The Mi-24, or Hind helicopter, is known as the "flying tank". Its rockets would have been the weapon deployed to target the oil depot in Belgorod, Russia.
This alleged attack alone will not dramatically alter the battle. But it could show Ukraine has managed to keep its air force functioning, and give a huge boost to the morale of Ukraine's military.
With all the lies being said by Putin and blackmail being made by Russia. Can anyone really believe Ukraine did this? The answer is no, no one can as lately Putin keeps lying to the Russian people to the world and to himself. Without proof of Ukraine soldiers bombing the oil deport with the video only shows it on fire from being bombed. By who? Is the question.
The only proof we have is Russian soldiers are targeting and killing unarmed citizens whether their soldiers or not. Yet, Russian soldier deny these claims when proof is in the shelling. As Ukraine isn't using shelling but Russia is using shelling.