Not from Poland and not in an any way affected country, but I believe I can answer your first question, and it comes down to basically Rossiya Segodnya.

Here's an investigation that discovered them operating in the Baltics: https://en.rebaltica.lv/2017/04/sputniks-unknown-brother/

Long story short, they open a news portal where tracking the ownership is almost impossible and where there is absolutely no hindsight on how do they monetize what they do, they attract readers by appealing to the Russian minorities, trying to create some sort of panic between them and hoping to create a chain reaction.