Neither. 6000 is nothing in terms of Russia’s fighting age population. If it came to it, there would be ways to streamline deployment much like in endgame Germany.

Paradoxically, if Russia were running out of troops to continue the war, I would expect the war to escalate

Putin cannot allow this war to end with a defeat. He is liable to be killed once the people turn on him

To avoid that outcome, the obvious choice would be conscription when troop numbers get low. Conscription is incredibly unpopular, as we saw in 2022; therefore, Putin would need additional justification for conscription. The justification would come in the form of an additional external threat -- NATO

NATO, obviously, has no intention of attacking Russia unless attacked themselves. Putin would need to attack NATO and provoke a response

It appears the US has intelligence suggesting Putin planned to do just that, which spurred John Ratcliffe's visit to Moscow. A trip that closely mirrors then CIA director William Burns' 2021 trip to discourage Russia from invading Ukraine

The goal is to keep support in the west high with a constant "we are not winning now, but we will very soon! (if we get enough weapons from you)". Same old story.