My experience is that micro-movements of elements of a family between nearby villages and cities was typical and had not really anything to do with the Ukraine, which did not come into lasting recognized existence until 1991. 

Rather, it had everything to do with coordinating marriages of the children of different, nearby families, requiring a member of one family to relocate to  the family of a spouse in an adjacent or nearby village (walking distance, really), the availability of work in a butcher shop, for example, and in the case of cities during the early 20th century, the location of economic opportunity and also the presence of the university.  Longer range movements often can be attributed to town scale or region scale disaster such as fire, pogrom or disease.  Indeed some waves of the late 19th and early 20th century migration can be linked to loss of economic opportunity in one's ancestral home resulting from an economic depression, disease or fire. 

It helps me to visualize a time when lifting up roots and relocating was not so difficult compared to modern times.  Today, to move to a town next door requires the listing and sale of an expensive asset (house) and the purchase of a new expensive asset (new house).  Or at least the expiration of one lease and the establishment of a new lease.  But a century ago, one could simply pack a bag and go live with the family of a new spouse.

--
Steven M. Greenberg

GRÜNBERG/ROZENWASSER/BERGMANN/KONIG (Gwozdziec / Obertyn/ Zablatov / Kolomyja, Ukraine)
KAHAN / KAHN / KAGAN / KRETZMAN (Kraslava, Latvia and Kowno / Kaunas, Lithuania)
URESTKII / URASKY / URETSKY (Mayzr / Kopkavichi / Klinkavichi, Belarus)
REINFELD/HOLTZ/ZIMMERMAN/ROTTLER (Lubaczow, Poland and Wielke Oczy, Poland and L'viv, Ukraine)
ERTAG/KALT (Gorodok, Ukraine and Przmysl, Poland and Dynow, Poland)
KUSHNIROV/PORTNOI (Zlatopil / Mikhailovka / Oleksandrivka / Smiela, Ukraine)