Deserted since the world's worst nuclear disaster in 1986, the exclusion zone surrounding the decommissioned Chernobyl power plant in northern Ukraine is one of the most inhospitable places on the planet.
But for Ukrainian troops resisting invading Russian forces, it has become a crucial training ground.
Covered in camouflage net, a Ukrainian army truck mounted with an anti-aircraft gun snakes through bare trees in the exclusion zone, just 15 kilometres (9 miles) from Ukraine's border with Moscow-ally Belarus.
Nearby, a tank carrying Ukrainian soldiers moves across a plain on the edge of the forest, rolling over patches of melting snow.
Many of the men here are not professional soldiers.
They were either called up or decided to join the army after Russia attacked Ukraine nearly a year ago.
"I am a math teacher. I did not have military training," said Vasily, one of the servicemen taking part in the drills.
"On the 24th, I was putting my affairs in order and on February 25, I signed up for the territorial defence," he added.
He said he has no doubts that Ukraine's border with nearby Belarus, an ex-Soviet country that last year allowed Russian troops to use its territory as a launchpad for its invasion, is securely guarded.
"Our border is locked down and no one will fly through here," Vasily said.
Chernobyl's number four reactor exploded on April 26, 1986, causing a nuclear accident that killed hundreds and spread radioactive contamination.
The plant, where the destroyed reactor is kept under a concrete and lead sarcophagus, is now surrounded by a 30-kilometre (20-mile) exclusion zone.
Russia remained in control for several weeks, sparking fears for the well-being of the 100 or so technicians who work at the site.
While the Russian army has withdrawn from the plant, the threat of its forces stationed just across the border in Belarus still remain.
"There is still a division of troops that continues to train on Belarusian territory," said Sergiy Nayev, a high-ranking officer in the Ukrainian army.
"The goal is to repel an enemy offensive from the side of the Republic of Belarus and prevent a landing," he added.
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© Agence France-Presse
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