No, that's not a great approach. One overreach and you're in a nuclear war.
That's pretty easy to stop - I'm sure NATO has already told Ukraine that an incursion into Russia proper would mean an end to military aid.
Really though, all we're waiting for is Putin to die from old age, or lose his hold, and then Russia will decend into anarchy.
Which will end the current threat, but open up others...
This means that anyone close to Putin, is likely lacking in capability, or perhaps more importantly, the ability to lead and drive loyalty.
Weak leaders fall fast, if they try to pick up the sceptre.
This isn't slashot. People don't need personal trolls here. Is there any reason you're following me around?