Large explosions rock Russian military air base in Crimea

Powerful explosions rocked a Russian air base in Crimea and sent towering clouds of smoke over the landscape Tuesday in what may mark an escalation of the war in Ukraine. At least one person was killed and several others were wounded, authorities said.

Russia's Defence Ministry denied the Saki base on the Black Sea had been shelled and said instead that munitions had blown up there. But Ukrainian social networks were abuzz with speculation that it was hit by Ukrainian-fired long-range missiles.

Videos posted on social networks showed sunbathers fleeing a nearby beach as huge flames and pillars of smoke rose over the horizon from multiple points, accompanied by loud booms. Crimea Today News said on Telegram that witnesses reported fire on a runway and damage to nearby homes as a result of what it said were dozens of explosions.

Russia's state news agency Tass quoted an unidentified ministry source as saying the explosions' primary cause appeared to be a "violation of fire safety requirements." The ministry said no warplanes were damaged.

Russian warplanes have used the Saki base to strike areas in Ukraine's south on short notice.

Ukraine's Defence Ministry said sarcastically on Facebook: "The Ministry of Defence of Ukraine cannot establish the cause of the fire but once again recalls the rules of fire safety and the prohibition of smoking in unspecified places."

Asked whether Ukraine was taking responsibility for the blasts,Mykhailo Podolyak,who advises President Volodomyr Zelenskiyy, told the Dozhd online television channel: "Of course not. What do we have to do with this?"

Podolyak suggested the blast could be linkedto Russian incompetence or an attack by partisans.

"People who are living under occupation understand that the occupation is coming to an end," he said.

Moscow could accuse Kyiv of crossing a red line if Ukraine were to acknowledge it had attacked territory that Russia sees as its own.

During the war, Russia has reported numerous fires and explosions at munitions storage sites on its territory near the Ukrainian border, blaming some of them on Ukrainian strikes. Ukrainian authorities have mostly remained mum about the incidents, maintaining an ambiguous stand.

If Ukrainian forces were, in fact, responsible for the blasts, it would mark the first known major attack on a Russian military site on the Crimean Peninsula, which the Kremlin annexed in 2014. A smaller explosion last month at the headquarters of Russia's Black Sea fleet in the Crimean port of Sevastopol was blamed on Ukrainian saboteurs using a makeshift drone.

Officials in Moscow have long warned Ukraine that any attack on Crimea would trigger massive retaliation, including strikes on "decision-making centers" in Kyiv.

For his part, Ukraine's president vowed to retake Crimea from Russia.

"This Russian war against Ukraine and against all of free Europe began with Crimea and must end with Crimea its liberation,"Zelenskyy said Tuesday in his nightly video address. "Today it is impossible to say when this will happen. But we are constantly adding the necessary components to the formula for the liberation of Crimea."

Attack on town near nuclear plant

Earlier Tuesday, Ukrainian officials reported at least three Ukrainian civilians were killed and 23 wounded by Russian shelling in 24 hours, including an attack not far from the Russian-occupied Zaporizhzhia nuclear power plant.

The Russians fired more than 120 rockets at the town of Nikopol, across the Dnieper River from the plant, Dnipropetrovsk Gov. Valentyn Reznichenko said. Several apartment buildings and industrial sites were damaged, he said.

Ukraine and Russia have accused each other of shelling the power station, Europe's biggest nuclear plant, stoking international fears of a catastrophe.

In his nightly video address Monday, Ukrainian President Volodymyr Zelenskyy invoked the 1986 disaster at the Chernobyl nuclear plant in Ukraine. He called for new sanctions against Russia, accusing it of risking another nuclear disaster.

"We are actively informing the world about Russian nuclear blackmail," he said.

A Russian-installed official in the partially occupied Zaporizhzhia region said an air defence system at the plant would be reinforced in the aftermath of last week's shelling. Evgeny Balitsky, head of the Kremlin-backed administration, told Russian state TV that power lines and other damaged portions of the plant were restored.

"The plant is operating normally but, of course, with an increased degree of security," Balitsky said.

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Shelling at Ukraine nuclear plant raises fears over health, environmental threats

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'Very high' risks at power plant: Ukraine's nuclear chief

The head of Ukraine's state nuclear power firm warned on Tuesday of the "very high" risks of shelling at the Zaporizhzhia nuclear power plant in the Russian-occupied south and said it was vital Kyiv regains control over the facility in time for winter.

Energoatom's chief, Petro Kotin, told Reuters in an interview that last week's Russian shelling had damaged three lines that connect the Zaporizhzhia plant to the Ukrainian grid and that Russia wanted to connect the facility to its grid.

Some of the shelling landed near storage facilities for spent fuel, an area that has 174 containers of highly radioactive material, Kotin said, warning of the dangers of them being hit.

"This is ... the most radioactive material in all the nuclear power plant. This would (mean) the distribution (of it) around this place and then we will have like a radiation cloud and then the weather will decide ... which direction the cloud goes," he said.

Kotin said Russia wanted to connect the plant to its grid, a technically difficult process that requires the facility to be severed from the Ukrainian system before it can be gradually connected to the Russian one.

"Their plan is to damage all the lines from the Zaporizhzhia nuclear power plant. After that it will not be connected to the Ukrainian power system," he said.

The nuclear plant has six reactors and produced 20-21 per cent of Ukraine's electricity needs before the war, he said. It urgently needs renovations that have yet to be carried out, he added.

"For winter season, we urgently need to remove these Russians from there, then to renovate infrastructure," he said.

Around 500 Russian troops are currently at the facility with heavy vehicles, and the plant is being used as a base, he said.

Kotin said the best solution would be for Russian troops to withdraw and for the plant to be returned to Ukrainian control. Peacekeepers could be sent in to guard the facility, he said.

WATCH | No confirmation Canadian soldiers are in Ukraine:

Gen. Eyre declines to say if Canadian troops operating in Ukraine

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Duration 8:44

Chief of Defence Staff General Wayne Eyre declines to confirm reports that Canadian special forces are on the ground operating in Ukraine in a training capacity: "We're never going to talk about discreet or sensitive special operations."