Ukraine’s foreign ministry has condemned an attack on a prison in territory held by Russian-backed separatists.

At least 40 Ukranian prisoners are said to have been killed in the attack.

Ukarain has appealed to the International Criminal Court over what it said were Russian war crimes.

In response, Russia said Ukraine carried out Friday’s attack.

Moscow has denied involvement in any war crimes in Ukraine.

In a statement, the Ukrainian government called on the Office of the Prosecutor of the International Criminal Court to urgently draw attention to the atrocities of Russian servicemen.

The Ukrainian government says this is in the context of the investigation of war crimes and crimes against humanity committed by citizens of the Russian Federation on the territory of Ukraine.

Such alleged crimes, it said, coincided with “another war crime by Russia – shelling of penal institutions in occupied Olenivka, where it is believed that Ukrainians were held prisoners of war”.