Russia-Ukraine updates: Putin says war was ‘unleashed’ on Russia

Russia has committed a "wide range of war crimes" and possible crimes against humanity in Ukraine, according to a new United Nations-backed investigation.

"The body of evidence collected shows that Russian authorities have committed a wide range of violations of international human rights law and international humanitarian law in many regions of Ukraine and in the Russian Federation," the human rights report by the Independent International Commission of Inquiry on Ukraine stated. "Many of these amount to war crimes and include willful killings, attacks on civilians, unlawful confinement, torture, rape, and forced transfers and deportations of children."

Additionally, Russian attacks on Ukraine's energy-related infrastructure and use of torture "may amount to crimes against humanity," the report concluded.

The commission said it conducted interviews with nearly 600 people, inspected graves, destruction and detention sites and consulted satellite imagery and photographs as part of its investigation.

Poland plans to deliver four MiG-29 fighter jets to Ukraine "in the coming days," Polish President Andrzej Duda said at a press conference on Thursday.

The move will make Poland the first NATO member to supply fighter planes to Ukraine, the Associated Press reported.

The latest news shortens the timeline announced earlier this week by Polish Prime Minister Mateusz Morawiecki, who had said they might send the Soviet-designed fighter jets to Ukraine in the next four to six weeks.

Ukrainian forces have killed 225 Russian fighters and injured another 306 in the past 24 hours in the Bakhmut area, according to Serhiy Cherevaty, the spokesman for the Eastern Group of Forces of the Ukraine army.

Russia and Ukraine have been locked in a brutal battle for the city in eastern Ukraine for months, with both sides seeing high rates of casualties.

Cherevaty said that in the last day, the occupiers in the area of Bakhmut and nearby villages -- including Orikhovo-Vasylivka, Bohdanivka and Ivanivskoho -- tried to attack Ukrainian positions 42 times. There were 24 combat clashes in the Bakhmut area alone.

In total, in the Bakhmut direction, the occupiers shelled Ukrainian positions 256 times with various types of artillery and multiple launch rocket systems, Cherevaty said. Of them, 53 shellings were in the area of Bakhmut itself.

-ABC News' Will Gretsky

Russia is working to increase its weapons production amid an "urgent" need, President Vladimir Putin said Wednesday.

"Prosecutors should supervise the modernization of defense industry enterprises, including building up capacities for the production of an additional volume of weapons. A lot of effort is underway here," Putin said at a meeting of the Collegium of the Prosecutor General's Office of the Russian Federation.

Putin added that the weapons, equipment and ammunition are "urgently" needed.

-ABC News' Will Gretsky