Thanks to “FamilyTree” (https://www.familytreemagazine.com/heritage/russian/genealogy-white-russian/) I’ve come up with two definitions of “White Russians” as follows:
In the 18th and 19th centuries, the term “White Russian” described ethnic Russians living in the area between Russia and Poland (today this includes Lithuania, Ukraine, Belarus, Latvia and Moldova). By the 1920s, the term was more commonly used for Russians who’d opposed the Bolshevik Revolution and supported the imperial government. More specifically, it meant those who fought against the Soviet Red Army in the Russian Civil War (1918 to 1921).
So my uncle, mentioned in my post from March 4, might not have come from the area between Russia and Poland. He could easily have been born in the heart of Russia and opposed to the Bolsheviks–Vladimir Ilyich Ulyanov (aka Lenin) included.
I don’t expect the real truth to step forward any time soon. I haven’t been in contact with my father’s side of the family for many years.
Regardless of any of the above, please pray for Ukraine.