Russia invades Ukraine

Ukrainian President Volodymyr Zelensky said everyone behind the Russian attack on the Kramatorsk train station will be held accountable.

“This is another war crime of Russia, for which everyone involved will be held accountable,” he said in his nightly address on Friday, adding that Russian state propaganda tried to blame Ukrainian armed forces for the attack.

Zelensky confirmed previous reports from the head of Donetsk region military administration, that at least 50 people were killed in the attack, including five children.

The Ukrainian President said “all the efforts of the world” will be directed to establish minute-by-minute “who did what, who gave orders, where did the rocket come from, who was carrying it, who gave the order and how the strike was coordinated.”

“Responsibility is inevitable,” he said.

The sudden ear-piercing beep of a radiation meter fills the room as a Ukrainian soldier walks in. This is where Russian soldiers were living at the Chernobyl nuclear power plant, and radiation levels are now higher than normal.

There's no visible presence of the source of the radioactive material in the room, but Ukrainian officials say it's coming from small particles and dust that the soldiers brought into the building.

CNN was given exclusive access to the power plant for the first time since it came back into Ukrainian control.

Officials at the plant explain the levels inside the room used by Russian soldiers are only slightly above what the World Nuclear Association describes as naturally occurring radiation. One-time contact would not be dangerous but continuous exposure would pose a health hazard.

It's an example of what Ukrainian officials say was the lax and careless behavior of Russian soldiers while they were in control of the site of the 1986 nuclear disaster. The area around Chernobyl, namely the Red Forest, is still the most nuclear contaminated area on the planet, with most of the radioactive particles present on the soil.

Ukrainian officials have released drone footage of what they say were trenches dug by Russian soldiers in that area, which is particularly radioactive. At a safe location, on the edges of that area, CNN saw a Russian military ration box that exhibited radiation levels 50 times above naturally occurring values.

Russian soldiers held Chernobyl for a month and are thought to have been operating in contaminated areas most of the time.

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Ukrainians shocked by 'crazy' scene at Chernobyl after Russian pullout reveals radioactive contamination

At least 50 people, including five children, were killed after Russian forces carried out a missile strike on a railway station in Kramatorsk, eastern Ukraine, that was being used by civilians trying to flee the fighting, Ukrainian officials said Friday.

Pavlo Kyrylenko, the head of the regional military administration in Donetsk, where the attack took place, said that 98 wounded people —  16 children, 46 were women and 36 men — were taken to local hospitals.

Ukrainian President Volodymyr Zelensky said earlier that nearly 300 people were wounded in the strike.

Read more here.