Zelenskyy says retreating Russian soldiers left thousands of unexploded bombs and mines across the country

Russian troops scattered unexploded bombs, mines, and trip wires as they retreated, according to Ukrainian President Volodymyr Zelenskyy.

In recent weeks, Ukraine said that Russia had moved troops away from the city of Kyiv and started an assault on the port city of Mariupol.

Zelenskyy said in a Monday night address that security work was underway in the northern regions of the country.

Russian troops left behind a lot of dangerous objects. These are shells that did not explode. Several thousand such items are thrown away daily.

Russian troops have caused the most damage during their invasion of Ukraine. Russia is accused of mining a road that was supposed to be an exit route for Mariupol.

The occupiers left mines all over the place. They took the houses. On the streets and in the fields. Zelenskyy said they mined people's property and cars.

They did everything they could to return to these areas as safe as possible. Our territory is one of the most contaminated in the world due to the actions of the Russian army.

Russian troops have been setting booby traps in the homes of Ukrainian police officers, first responders, and members of the military, according to Denys Monastyrsky, the interior minister of Ukraine.

The bodies of people who were killed were also mined by Russian forces, according to Zelenskyy.

Zelenskyy said that Russia was prepared to use chemical weapons for the first time in the conflict.

The Azov Regiment, a right-wing paramilitary group, said on Telegram that Russia used chemical weapons on Ukrainian forces hiding in a steel plant. The US said it was keeping an eye on the reports.

The US and UK are looking into reports that Russia is using chemical weapons.