I was reading about the time of the difficulties that occurred in Russia and reading the whole context I imagined the creation of this great commonwealth gathering Poles, Lithuanian, Swedes and Russians.
I'm not an expert on this subject, but from what I've read, I include these POD's.
Sigismund III is not overthrown by Charles IX of Sweden, Władysław remains in the throne and Russia remains Orthodox.
Beside these pods what could we include to create this Commonwealth?
If she is created, how stable she would be, and what influences would she bring?