A new repot released on Friday documents 40 summary executions by both the sides. Notaly, 25 of these executions were carried out by Ukrainians against Russian PoWs and 15 were by Russians of Ukrainian PoWs. Such acts could amount to war crimes.?

The report also found evidence of the use of torture, human shields, and other abuses against POWs since February 24, 2022 when Vladimir Putin announced the Russian invasion of Ukraine, dubbed as the "spcial military operation".

The report was based on interviews with about 400 POWs, half of them Ukrainians who were released and the other half Russians held captive in Ukraine. The team said it had no access to POWs held in Russia or Russia-occupied parts of Ukraine where it identified 48 internment sites.?

The UN rights office, which has had a monitoring team in Ukraine since fighting broke out in areas of eastern Ukraine claimed by Russia-backed separatists in 2014, has said its findings are based on confirmed cases and typically understate actual tolls.

"We are deeply concerned about the summary execution of up to 25 Russian prisoners of war and persons ordered to combat by Ukrainian armed forces, which we have documented," Matilda Bogner, the head of the UN monitoring mission, said at a Kyiv news conference.

Bogner laid out abuses allegedly committed by both sides but noted that Russia's invasion of Ukraine was at the root of the violence against civilians and POWs. She said Ukrainian prosecutors were investigating some cases, but none had been taken yet to court.

She said, "In relation to the treatment of Ukrainian prisoners of war, we are also deeply concerned by the summary execution of 15 Ukrainian prisoners of war shortly after being captured by Russian armed forces. The Wagner Group —military and security contractors— perpetrated 11 of these executions."

It also documented five cases in which Ukrainian POWs had died after being tortured or otherwise ill-treated, and four cases of death due to a lack of medical attention during internment.

The report found that while abuse of POWs took place on both sides, it was far more common against Ukrainians — more than 9 in 10 of interviewees reported abuse — than against Russians, about half of whom testified to abuse.

In its update on rights abuses affecting other groups, the rights office said children from the city of Kharkiv in northeastern Ukraine were sent to “summer camps” in Russia with their parents' consent but were not returned home as expected after the vacation period.?

Several parts of Kharkiv province were occupied by Russia last year before Ukraine's military reclaimed them in a late summer counter-offensive.

Some 200 children set to a camp in the Russian city of Krasnodarskyi Krai, remained after the summer and were enrolled in a local school, according to the second report.?

The update noted that Russian authorities said in October that as many as 2,500 children from Ukraine were living in temporary accommodation centers in Russia, and some had remained there.

But the right office cautioned that it remained unclear how many unaccompanied children were placed in camps, temporary lodging or institutionalised care in Russia, as well as how many children were transferred there with their parents.

The UN reported earlier this week that it had recorded the deaths of 8,317 civilians in Ukraine since Russia's invaded on Feb. 24, 2022, and the injuring of another 13,809 people in connection with the conflict. It cautioned that those figures understated the actual casualties.?

(With AP inputs)