The informant, in this case, is my father, F, who was a first generation immigrant born to an Ukrainian/Scottish family in Canada in 1950. His family was poor and working class, and he lived in Canada for many years before attending schools in England, and eventually moving back to Canada before moving with my mother to Los Angeles, in the United States, so she could take a job as a university professor. My brother and I were born a few years after.
My father told me this joke at dinner once. He asked me if I wanted to hear a Ukrainian joke and I said sure.
F: “You are a Ukrainian soldier in the trenches, the Germans coming from one side, the Russians from the other. Who do you shoot first?
Answer: The German. Business before pleasure.”
I think this is probably considered an offensive joke. It has a certain historical context, I suppose, but my father never provided any of his own thoughts on the joke, so all I can really do is to provide the joke in it’s original form. I do not think my father learned this joke from his father, I think he probably picked it up somewhere later in life. I tried to search online for traces of this joke, and I was able to find it but with the Ukrainian soldier replaced with a Polish one, so I guess it is re-told in that way and adopted by different cultures with a similar wartime history.