In his old age, Josef hadn't seen the Doctor in 25 years, and he wanted to meet him again. He had one of his soldiers, Andrei, capture Ace, and the Seventh Doctor arrived. Josef asked what his legacy would be, and the Doctor claimed to him that, though people would vilify him for over a century, they would eventually realise that he had done the right thing, and they would continue his work.

https://tardis.fandom.com/wiki/Joseph_Stalin