  X-ray binaries have been an important key in understanding the jet-disc
symbiosis in accreting black holes on all mass scales, from stellar-mass to
supermassive black holes. SS433 was the first Galactic XRB that has been
extensively studied in the radio regime. The radio properties, including the
highest angular resolution data can now be better understood in the framework
for accretion disc state transitions that is observed in microquasars (black
hole X-ray binary systems). SS433 remains unique in various ways to date, and
there is still much to learn about black hole accretion phenomena. In the
meantime, the electronic very long baseline (e-VLBI) developments at the
European VLBI Network (EVN) has allowed us to study microquasars and other
transients at milliarcsecond resolutions more flexibly than was possible
before. Even more new opportunities will arise as the SKA pathfinders become
operational.
