I never met a Pole over 45 who can’t speak Russian, at least to a some degree.
Of course they taught Russian in school in Poland, but nobody would speak it if they didn’t have to.
When I first heard a Polish speaker a few years ago, I recognized some of the words.
Our dear family friend from 1972 until his death, wrote several extensive English/Russian dictionaries. He and his wife spoke/speak fluent Russian.
https://www.legacy.com/us/obituaries/rgj/name/paul-macura-obituary?id=19932698