What if: Stalin sends a Soviet Expeditionary Force to Italy in 1943

  Only if something, most likely probably US opposition to the OTL Italian campaign means that the allies occupy little or none of Italy.  It would also depend on whether any equivalent of the OTL Yalta Agreement sets lines of occupation in Europe as I doubt that Stalin would chase retreating fascists into northern Italy if he had already committed to it being in the western sphere of influence.

  Of course if the western allies had ignored Italy then had a disastrous invasion of  N France in say 43 and/or other problems it might end up with the Soviets reaching the Spanish border in which case they might also seek to occupy Italy and there is unlikely to be any agreement with the western allies.