I think they would be very happy if the rest of Europe were utilizing GLONASS, a system they can shut down or manipulate if they need to.
But they themselves can't get it to work, as was highlighted in the link I posted. So why would a Europe unable to deploy Galileo use GLONASS instead of GPS?
And it certainly isn't like Europe doesn't have its own space launch capabilities.
Russia has absolutely nothing to gain and much to lose by trying to fuck with this launch.