Unlikely. If Putin goes. Most likely, he'll be replaced by a nationalist. Alexander Bortnikov would be my guess.
Russia was in way worse shape back in 1999. It was at brink of anarchy. That's not the case today. Russia is in a stupid war. There is economic stagnation. Political repression. But people are much better off than they were in 1999. They are not thriving but they are suffering a lot less today (unless you are a conscript fighting in Ukraine then yes it sucks to be you because you are cannon fodder).
300 tanks
500 infantry fighting vehicles
500 modern artillery tubes
unlimited ammunition
By the time we are able to get them there, the war may already be over. That's not something you can pack up & deliver in a week, or even a month. Now if the Russians hold off for 5 months, they might get them in time, but that's not the reality.