Russia doesn’t pay people for that sort of thing, especially not a person like Musk. Instead they extort. Possibly over rare materials.
Anyway I don’t think Russia was part of Musks takeover of twitter, that stemmed from Musks own arrogant stupidity, but they certainly did become one afterwards.
He is bringing back a very carefully selected group of banned people, people he thinks caters to the only specific core audience which remains on twitter: hateful right wing bigots.