You guys expect the worst from these things. What will really happen is either:
A. The Russian army just moved around showing off their toys and then leaves a few weeks later
B. Nothing happens, Russia stays in their naval base
C. Russia finds some sort of justification to send in peace keeping troops, Ukraine becomes a puppet state. NATO condems Russia, does nothing. A few minor embargos and sanctions are placed.
Not:
A. Tiny country gets invaded and we go into WW3