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With a POD of Ivan the Terrible having a competent and surviving son and Ivan the terrible not being crazy.
I was just wondering is it possible for the PLC to lose all of its Ruthenian lands because of the Ukrainians and Belarusians uniting with Russia due to the people being against union of brest because they believe it is an act to Polonize the Ruthenians which ends up with the Ruthenian parts of the PLC or rather Poland-Lithuania being gained by Russia/Muscovy, if this happens how will the Rump PLC survive or would the Polish and Lithuanian parts of the PLC end up being partitioned.