So true. By this point, Russia is already using everything it can, short of an actual, hot war with the west. And their military is stretched to the limit already without that.
I think this sabre rattling is still useful to them as a one-two-tactic:
Public threat from Russia, mentioning but not directly threatening nukes (the "push" side)
Russia-aligned media in the west publish articles saying "Putin's threat should be taken seriously," Russia-aligned western politicians smearing their opponents as "irresponsible war mongers", followed by pushing for existing sanctions to be lifted, etc. (the "pull" side via stooges/crooked politicians)