Russian divers will examine on Sunday the damage caused by a powerful blast on Russia’s road-and-rail bridge to Crimea that hit a prestigious symbol of Moscow’s annexation of the peninsula and a key supply route to forces battling in southern Ukraine.

Saturday’s explosion on the bridge over the Kerch Strait, for which Russia did not immediately assign blame, prompted gleeful messages from Ukrainian officials but no claim of responsibility.

Russian news agencies quoted deputy prime minister Marat Khusnullin as saying the divers would start work at 6:00am (0300 GMT), with a more detailed survey above the waterline expected to be complete by day’s end.

“The situation is manageable - it’s unpleasant, but not fatal,” Crimea’s Russian governor, Sergei Aksyonov, told reporters. “Of course, emotions have been triggered and there is a healthy desire to seek revenge.”

The peninsula had a month’s worth of fuel and more than two months’ worth of food, he said. Russia’s defence ministry said its forces in southern Ukraine could be “fully supplied” through existing land and sea routes.

Russia seized Crimea from Ukraine in 2014 and the 19-km (12-mile) Crimean Bridge linking the region to Russia’s transport network was opened with great fanfare four years later by President Vladimir Putin.

Conceivably the Russians can rebuild it, but they can’t defend it while losing a war
Political analyst James Nixey of Britain’s Chatham House think tank

Kyiv demands that Russian forces leave the Black Sea peninsula, as well as Ukrainian territory they seized in the invasion Putin launched in February.

The bridge is a major artery for the Russian forces that control most of southern Ukraine’s Kherson region and for the Russian naval port of Sevastopol, whose governor told locals, “Keep calm. Don’t panic.”

This video grab taken and released on 8 October, 2022 by the Russian Investigative Commitee shows committee investigators working on the Kerch bridge -- linking Crimea to Russia -- which was heavily damaged following a truck explosion

It was not yet clear if the blast was a deliberate attack, but the damage to such a high-profile structure came amid several battlefield defeats for Russia, and could further cloud Kremlin reassurances that the conflict is going to plan.

Putin signed a decree on Saturday instructing tighter security for the bridge as well as the infrastructure supplying electricity and natural gas to Crimea and ordered an investigation.

“Conceivably the Russians can rebuild it, but they can’t defend it while losing a war,” said political analyst James Nixey of Britain’s Chatham House think tank.

Russian officials said three people had been killed, probably the occupants of a car travelling near a truck that blew up. On the bridge’s upper level, seven fuel tanker wagons of a 59-wagon train heading for the peninsula also caught fire.

Undoubtedly, we are witnessing the beginning of large-scale negative processes in Russia
Zelenskiy adviser Mykhailo Podolyak

Limited road traffic resumed about 10 hours after the explosion, and Russia’s transport ministry cleared rail traffic to restart.

‘Happy Birthday, Mr President’

The Kerch bridge blast came a day after Putin’s 70th birthday, coinciding with Russia’s third senior military appointment in a week. It designated Air Force general Sergei Surovikin to take charge of the invasion effort.

Ukrainian president Volodymyr Zelenskiy did not refer to the blast in a video address on Saturday, saying merely that the weather in Crimea was cloudy.

A color infrared satellite image shows a close up view of smoke rising from a fire on the Kerch bridge in the Kerch Strait, Crimea, on 8 October, 2022

“But however cloudy it is, Ukrainians know ... our future is sunny,” he added. “This is a future without occupiers, across our territory, particularly in Crimea.”

The head of Ukraine’s National Security and Defence Council posted a video of the bridge on social media alongside a video of Marilyn Monroe singing “Happy birthday, Mr President”.

Since the war started on 24 February, Ukrainian officials have regularly suggested they want to destroy the bridge. Ukraine’s postal service said it would print a special stamp.

“Undoubtedly, we are witnessing the beginning of large-scale negative processes in Russia,” Zelenskiy adviser Mykhailo Podolyak said in a commentary, blaming infighting among Putin’s circle as he attributed the blast to Russian operators.

Russian foreign ministry spokeswoman Maria Zakharova said Kyiv’s reaction to the destruction of civilian infrastructure “testifies to its terrorist nature”.

A couple takes a selfie in front of an artwork shaped as a big stamp untitled (with a play on words) "Cotton to the Crimean Bridge" created by Andrusiv V., Serdyukov O., Kalinovska Y., Visich M. depicting today's explosion on Kerch bridge, set in the center of Ukrainian capital of Kyiv on 8 October, 2022

The Russian National Anti-Terrorism Committee said a freight truck had blown up on the bridge’s roadway at 6:07am (0307 GMT). It said two spans of road bridge had partially collapsed, but that the arch spanning the channel through which ships travel between the Black Sea and Azov Sea was not damaged.

Emergencies minister Alexander Kurenkov told state news agency TASS that quick-thinking railway workers who uncoupled the burning fuel wagons had kept the blaze from spreading.

Images showed half of the roadway blown away, with the other half still attached.

Moscow has portrayed largely Russian-speaking Crimea as a historic part of Russia and, especially this year, one where its citizens could holiday.

The blast “will not affect army supply very much”, said Kirill Stremousov, the Russian-installed deputy administrator of the Kherson region.

“But there will be problems with logistics for Crimea,” he added in a social media post.