I've looked at a couple of sources online.

Originally Russian broadcasters were only suspended from Eurovision that year because many other members refused to participate.

A month or so later, the suspension of Russian broadcasters from the EBU was announced for the reasons I named above.

But I think one important correction could be made to what I said: It is possible to suspend members from Eurovision for stability reasons. Israel would presumably not be able to be suspended from the EBU entirely like Russia and Belarus were - after all Turkey and Egypt are still members - but a suspension from Eurovision for the same reason as Russia is plausible if enough members refused to participate.