A Russian freight train that was allegedly transporting oil and building supplies to the battle lines in Ukraine was derailed by an explosive device.
Several carriages are seen on fire and running off the tracks in the Bryansk region of Russia, less than 40 miles from the border, in video footage that was apparently taken shortly after the attack at around 10.20am local time today.
Later footage depicts the fire being put out and the carriages being nearly completely destroyed.
Military supplies have already been sent to Russian forces fighting in Ukraine using this method.
Local governor Alexander Bogomaz said there had been no injuries.
Russian authorities claim the border region, between Belarus to the west and Ukraine to the south, has witnessed repeated attacks since February of last year.
The explosion also comes as Alexander Drozdenko, governor of Leningrad Oblast, claimed on Telegram that a separate act of sabotage had destroyed key power lines outside of St Petersburg.
Mr Drozdenko added in his statement that the FSB, Russia’s federal security service, were investigating the incident.
He did not say which group authorities believe to have been responsible.
More than 14 months after Russia launched its full-scale invasion, Ukraine is preparing to stage a significant counteroffensive against Putin’s forces with the aid of munitions, armoured vehicles and tanks supplied by Western allies.
Intelligence chief Major-General Kyrylo Budanov recently hinted Ukraine had been directly behind many of the acts of sabotage on Russian soil.
He said: ‘Much of this is no accident. Something is constantly on fire [in Russia]. Signalling equipment on railways, it lights up several times a day, on various highways constantly for two to three hours, sometimes five to six hours, traffic gets suspended.
‘Clearly it doesn’t just happen like this… I would put it this way: money works wonders.’