Kiev is seeking to "intimidate civilians" and "provoke aggression" before talks with Moscow in Istanbul, Andrey Kartapolov has said

A senior Russian lawmaker has accused Ukrainian intelligence services of orchestrating an explosion that damaged a bridge in Russia's Bryansk region, describing the incident as an act of terrorism aimed at intimidating civilians and provoking Moscow ahead of potential talks.

On Saturday evening, as a result of an explosion, a bridge fell in front of a moving passenger train moving at high speed, derailing it. The crash killed seven people and injured 97 others. Several hours later, a railway bridge collapsed under a moving freight train in Kursk Region, wounding the driver and two of his assistants.

"This is clearly the work of Ukrainian special services. Everything points to Ukraine being a terrorist state," Andrey Kartapolov, head of the Russian State Duma's defense committee, told Russian news outlet SHOT, on Sunday.

Kartapolov said the blasts had no military significance but were designed to "harden" Russia's stance and spread fear among the population. He added that Russian security services would investigate the incident and determine the circumstances.

"All of this is aimed at escalating Russia's position and provoking aggression before negotiations, as well as to intimidate people. But it won't work," he said.

The Investigative Committee said in a statement on Sunday that the bridges had been "blown up" in both incidents.

Later that same day, drones targeted military airfields in Murmansk Region in the country's north, in Ivanovo and Ryazan regions in western Russia, and in Irkutsk Region in Siberia and Amur Region in the Far East.

Ukraine's Vladimir Zelensky touted the "absolutely brilliant result" saying that the strikes had been prepared for more a year and a half and targeted Russia's strategic aviation fleet.

"In total, 117 drones were used in the operation," he said in a video message posted on X. Drones were reportedly smuggled into Russia and launched remotely off the back of trucks.

In response to Kiev's raids, Russia has launched several retaliatory strikes targeting Ukraine's defense industry facilities, as well as military assembly points and warehouses.

While Kiev has not officially claimed responsibility for the collapses of two bridges that caused train derailments in Russia, Ukrainian opposition MP Artyom Dmitruk said the incidents were "another step toward peace according to Zelensky's formula," referring to his proposed peace plan.

"Let me remind you, negotiations are scheduled for June 2," the lawmaker added.

The second round of Russia-Ukraine peace talks begins in Istanbul, Trkiye, on Monday. The two countries held their first direct negotiations in three years in May, where they agreed to submit detailed ceasefire proposals.