Yes, this is why Poland expelled
Why preserve image of Poland as fanatically against Russia, when it isn`t truth. That just isn`t truth.
Why Poland expelled Russian diplomats? Let me tell you why. It must give something to EU cow so EU cow allow Poland some more milking. This is most simplistically speaking.
Much more important thing for Slavic world is that Poland allow to Russia use of Poland`s air space for sending weaponry to Serbia. THAT is much more important than expelling diplomats. As far as we know, right in this moment Russia thru Poland`s air space maybe transport more S-400 or even S-500 to Serbia, or Armata tanks, Mig-31 or ICBM. Poland don`t ask, don`t disrupts transports. You heard what said commander of Hungarian army when NATO and EU protested? He perfectly calm said `Well, but they using civilian planes for transport. And all papers/documents are fine. Everything is legal`.
See, there is the deeper deal behind all this that include entire Visegrad. No, Poland isn `t stupid. Non in Central Europe is stupid. Western Europe wants to fo* with Russia, western Europe play that sex without Central Europe. Not to say that Poland have its very own interests to see Serbia strong and well armed. If that arms comes from Russia, fine with Poland.