Benjamin Ferencz is the last surviving Nuremberg prosecutor. He says Vladimir Putin is "certainly" a war criminal.

By Haley Ott, CBS News

As Ukrainian authorities and the international community work to meticulously collate mounting evidence of Russian war crimes in Ukraine, the last surviving prosecutor from the Nuremberg trials of World War II-era Nazi officials told CBS News that Russian President Vladimir Putin is "certainly" a war criminal.

Benjamin Ferencz, now 102, fought in some of the most significant battles of World War II. He was a young lawyer, recently graduated from Harvard Law School, when he was assigned to a unit tasked with gathering evidence of the Nazi's war crimes in Europe.

"It was horror. It was incredible and indescribable. My job was to get into the concentration camps as they were being liberated, so by the time I got there, the SS was fleeing. The American army was chasing them, and the ground was covered with dead people, some of them still partly alive, pleading with their eyes for help. All of them looked like they were starving. It was not only an unforgettable experience, it was completely traumatic, and I always have that picture," Ferencz told CBS News.

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