In a separate incident in the Russian region bordering Ukraine, two bridges collapsed, killing at least seven people and injuring dozens of people.

State media said the collapse was explored as an act of terrorism.

The governor of the region said a road bridge in Bryansk drove towards Bryansk late Saturday, bringing several heavy trucks to a moving passenger bus.

Governor Alexander Bogomaz said at least seven people were killed and at least 71 were injured.

Acting state governor Alexander Khinshtein said a few hours later another bridge collapsed in the Zheleznogorsk area of ​​Kursk and derailed the locomotive.

Khinshtein said the train caught fire and the driver suffered a leg injury.

"The reason for the collapse of the bridge will be established. All emergency services are working on the spot. I am in control of the situation," Khinshtein wrote in the telegram.

The Moscow Railway accused the Briansk Bridge of landing in a telegram due to "illegal interference".

Ukrainian national security officials said the incidents were "false" actions by Russia and aimed at "manipulating international opinions" ahead of peace talks held by Russia and Ukraine in Türkiye on Monday.

Andrii Kovalenko, head of the Ukrainian National Security and Defense Commission's Center for the Opposition to False Information, accused Russia of "derailing the foundation for negotiations."

He added that Ukraine “has absolutely no motivation to undermine the Istanbul summit.”

The Kremlin said Russian President Vladimir Putin briefed the incident throughout the evening.

Bryansk's pictures online show climbing up the wreckage in the dark, helping each other.

The Moscow Regional Traffic Attorney's Office said an investigation has been conducted.

Authorities said the train's locomotive and several cars fell on the road.

According to Russian news agency Tass, other emergency workers, as well as rescue equipment and light towers that work at night were also sent to the area.

Officials said the train was heading from the town of Kremvo to Moscow when it collapsed, in the Vigonichiski region.

"The passengers were evacuated and directed to a party point at a nearby station," the Moscow Railway said, adding: "They will be able to continue the journey on a specially composed reserve train from Bryansk to Moscow.

The first incident occurred about 100 kilometers (62 miles) from the Ukrainian border.

Meanwhile, the Ukrainian Air Force said seven regions were attacked by fierce Russian strikes overnight on Saturday, with a total of 472 drone and drone strikes and seven missile strikes.