Ukraine has launched a "massive" drone attack on Russian military bombers in Siberia, attacking more than 40 fighter jets from its own territory, a security official said.

Claims cannot be verified independently. But if confirmed, the attack would mark Ukraine’s most destructive drone strike to date ahead of the escalation of the cross-border invasion, ahead of the peace talks held in Istanbul.

"The Ukrainian security service is undertaking a special operation on a large scale aimed at destroying enemy bombers away from the front," Agence France-Presse quoted the official as saying that a fire broke out in the target Belaya Airbase.

The official, who spoke on condition of anonymity, said the strikes were carried out by Ukraine's SBU domestic intelligence agencies, while attacking four Russian military air forces.

More than 40 aircraft are TU-95 and TU-22 strategic bombers, which Russia uses to launch long-range missiles in Ukrainian cities.

Reuters said the source reportedly provided video showing the strike, with several of the large aircraft appearing to be TU-95 bombers on fire. The TU-95 was originally used to carry nuclear bombs and now launches cruise missiles.

Several media outlets in Russia and Ukraine reported that Ukraine had carried out operations by launching drones on trucks near military airports deep in Russia.

According to sources cited by Ukrainska Pravda, the operation (codenamed "Spiderweb") has been prepared for more than 18 months. The media reported that the drones were first smuggled to Russia and later hidden under the roof of a small wooden structure on the van.

MASH is a telegraph channel linked to Russian security services, which publishes videos that show in the Irkutsk area of ​​Siberia, climbing onto a van in an attempt to prevent drones from rolling out.

Videos from several Russian military airports show that the planes engulfed by flames and planes were destroyed, although the total losses caused are still unclear.

In one clip, a Russian soldier was heard saying, "This is fucking here" when several bombers burned in the backstage at a clip taken at the Burning Airbase in Voskresensk, Moscow region.

Since the full invasion began in February 2022, Ukraine has long surpassed Russia as Russia in terms of military firepower. But it has developed an agile and larger attack drone to defeat Russia's military and energy infrastructure.

The Belaya Air Force Base targeted on Sunday was reportedly the Irkutsk Oblast in Russia, which is more than 4,000 kilometers from Ukraine.

Ukraine's Kyiv Independent reported that the state's governor Igor Kobzev later confirmed "drone attacks on military forces in the village of Sredny" but did not provide further details.

The attack occurred when Russian investigators said they believed the "explosion" caused two bridges to collapse overnight, derailing, killing at least seven people and injuring dozens of people.

In Bryansk, bordering Ukraine, a road bridge collapsed on the railway line late Saturday and derailed, a passenger train heading to Moscow, killing at least seven people. Officials said a railway bridge near Kursk also collapsed overnight, derailing the freight train and injuring the driver. Kursk also borders Ukraine.

It said that Murmansk Governor Andrey Chibis also confirmed that "the enemy has attacked the territory of the Murmansk region."

Ukraine said in March that it had developed a new drone with a range of 3,000 kilometers without providing further details.

In addition, the Ukrainian Air Force said that Russia had launched 472 drones overnight, the highest night war of the war so far, with seven missiles.

Ukraine had previously refused to attend a new round of direct talks in Turkey, but President Volodymyr Zelenskyy said on Sunday that a delegation led by his defense minister Rustem Umerov would be in Istanbul.

“I also defined positions before Monday meetings in Istanbul”, which included meeting priorities for a “completely unconditional ceasefire” and said on social media that the return of prisoners and kidnapped children was reported.

With Reuters and France's conscience