If Putin wants to threaten tac nukes to reverse shitty conventional capabilities, while claiming to be a 'great decolonizer', and were already giving NATO intel and weapons to Ukraine...why not let them in, or at least give Ukraine provisional status.
Also, if we can turn the Russian army back against Moscow, that would be the best way to deal with the rot in Moscow in a more permanent fashion. If the commies can be rooted out of their 'homeland', maybe it will make it easier to fight them elsewhere.