  Adding VLBI capability to the SKA arrays will greatly broaden the science of
the SKA, and is feasible within the current specifications. SKA-VLBI can be
initially implemented by providing phased-array outputs for SKA1-MID and
SKA1-SUR and using these extremely sensitive stations with other radio
telescopes, and in SKA2 by realising a distributed configuration providing
baselines up to thousands of km, merging it with existing VLBI networks. The
motivation for and the possible realization of SKA-VLBI is described in this
paper.
