WI:Poland-Lithuania loses all of its Ruthenian lands to Russia

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.
 
It will depends on were the new border would be established. I can see them losing Minsk, Polotsk, Smolensk and Kiev, but not the Ruthenian Lands, IMHO probably even less than Russia gained by the IOTL second partition of Poland-Lithuania. I do not see PLC be totally partitioned, it might be a catalyst for some needed reforms. Also the PLC might be more focused on the Baltic instead, IOTL they controlled Livonia, Courland & Semigallia and Prussia, maybe they now also try to gain Estonia too.
 
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