Why did the Polish–Lithuanian–Muscovite Commonwealth never materialize?
Incompatible demands from both sides
Lack of resources
Military defeat
Lack of support from the people
Answer
The Polish–Lithuanian–Muscovite Commonwealth never materialized because of the incompatible demands from both sides. Despite several serious attempts, the proposed union could not be realized.
From Union to Division: Exploring the Polish-Lithuanian-Muscovite Commonwealth