Poland should have never recognize kosovo
Tragic mistake by Poland to take part in partition of country that gave military elite to Polish-Lithuanian Commonwealth. Actually, Serbian influence gave Golden Age to medieval Poland. So yes, stubbing Serbs in the back was very shameful act by official Poland.
That said, 3SI is a chance for Serbia to grow.
I said its interesting but, be aware that borders between Serbia and what is now Greater Croatia aren`t settled. When that is over and when Serbia re-merge with Crna Gora (Montenegro), Bosnia and Herzegovina and when Kosovo and Metohija are liberated and when question of Macedonia is solved, then we talk.
But tell me, how do you plan to prevent Germany from controlling Greater Croatia? Its impossible. Only pray Serbian justice to be swift and we liberate what is ours. What is ours was always open to Polish interests.