Donetsk is much in the news at the moment, being one of the centres of the Russia-Ukraine conflict. Donetsk used to be called Yuzovka, occasionally written Hughesovka, after Welshman John Hughes (russified pronunciation is Yuz), who founded it as an industrial city. John Hughes, who was from Merthyr Tydfil, was a skilled ironworker who owned a foundry. He and several dozen Welsh workers sailed to Russia in 1870 to build a metalworks near the village of Aleksandrovka. The Hughes factory gave its name to the settlement that built up around it.
There have been a couple of books published about John Hughes (see here and here). Hear an interview from Radio Wales in 2010 with Colin Thomas, author of one of those books here.
The BBC Monitoring Service reported last year on a tongue-in-cheek campaigning group calling for Donetsk to join the UK because of its history. Read the piece here.