Vladimir Putin has accused Ukraine of "terrorism" over the Crimea bridge blast.
The despot ominously claimed the Ukrainian secret services had destroyed a piece of "critical civilian infrastructure".
It comes after shocking footage showed the moment a fireball engulfed the bridge.
The Ukrainian government tweeted "sick burn" in response to the explosion on Saturday, although it did not claim responsibility.
In a clip released this evening, Putin said: "There is no doubt. This is an act of terrorism aimed at destroying critically important civilian infrastructure.
"This was devised, carried out and ordered by the Ukrainian special services."
Putin made the claims during a meeting with Alexander Bastrykin, who is leading Russia's investigation into the blast.
Investigative Committee, who was presenting findings of an inquiry into Saturday's explosion and fire on the bridge.
One senior military veteran in Russia said he believed the blast may have been caused by a "suicide bomber", PDM News reports.
Alexei Filatov, who heads a union for Russia's elite counter-terror unit Alpha Group, said: "Two options are possible.
"The first option is a suicide bomber, and the second, which most often happens, is the use of a driver and an explosive device in the dark.
"That is, they loaded an explosive device, put the fuse on a signal or on a phone call, and at the moment the truck was at the right point, an explosion was made.
"The driver may or may not have been aware of this. So it's easier. Among the Slavs (and the conflict is now going on between the Slavs), as a rule, there are martyrs and bloodlines who go to any lengths, but not many."
The bridge, which connects Crimea with Russia, is a key supply route for Moscow's forces in southern Ukraine.
It is also a major artery for the port of Sevastopol, where the Russian Black Sea fleet is based.
Images showed half of a section of the bridge's roadway blown away, with the other half still attached.
Rail services and partial road traffic resumed today.
Crimea's Russian governor, Sergei Aksyonov said: "The situation is manageable - it's unpleasant, but not fatal.
"Of course, emotions have been triggered and there is a healthy desire to seek revenge."
Residents in Crimea started panic buying fuel following the explosion.
