An explosion set fire to and destroyed sections of Russia's only bridge to Crimea, isolating Russia and its troops from the critical Black Sea peninsula at a critical time in the war, though the cause for the explosion remains unclear.

TOPSHOT-RUSSIA-UKRAINE-CONFLICT-WAR-BRIDGE

There is a fire on the bridge that leads to Russia.

AFP via Getty Images

Three people were killed when two fuel tanks exploded after a fuel storage tank caught fire on the bridge.

No threat to maritime traffic in and out of the Sea of Azov was posed by the fire.

Two sections of the six-year-old bridge, connecting Russia with the peninsula, which it annexed from Ukraine in 2014, collapsed in the explosion, but the total extent of the damage has not yet been determined.

Not only does the bridge support vehicle traffic for commuters and the transportation of goods, it is also Moscow's main military link for fuel, troops, and equipment, meaning the explosion could pose a critical blow to Putin.

The New York Times reported that the explosion was an emergency, but the head of the parliament in the peninsula called it insignificant.

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It could have been a military strike. The truck that exploded was owned by a resident of Russia's Krasnodar region, according to the report. Shortly after the explosion, the Ukrainian government stated in a social media post: "sick burn", while the foreign minister of Estonia said that the explosion was likely caused by the special operations units. It is not known who is responsible for the incident.

Key Background

Putin has called up an additional 300,000 reserve troops and threatened to use nuclear weapons as he escalates Russia's invasion. Following his annexation of the peninsula, Putin referred to the bridge as a sacred place. Russian troops have been forced to surrender in areas along the Black Sea and eastern Ukraine in the last few months. Putin blamed saboteurs for the destruction of a Russian depot by Ukrainian special forces. The advisor to the minister of internal affairs said that more than 38,000 vehicles crossed the bridge in the days after the attack.

Surprising Fact

After Ukrainian forces refused to surrender to the Russians at Snake Island, the postal service of the country created a stamp to commemorate the event. The stamp pictured a Ukrainian soldier holding up their middle finger to a Russian ship and was seen as a sign of resistance to Putin.

Huge fire erupts on strategic bridge linking Crimea to Russia

A screen grab from a video shows fire and smoke after an explosion.

Anadolu Agency via Getty Images

Explosion caused fire on strategic bridge linking Crimea to Russia

There is not yet a reason for the blast.

Anadolu Agency via Getty Images

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A truck explosion caused a huge fire and damaged the key bridge.

AFP via Getty Images

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