The combat in Ukraine

I have a problem; we know that Ukraine is a corrupt country
we also know it has fought a low-level war against
the Russian-speaking people in the Donbas region, so Russia
intervened, so far so good, but what is the next step?
If Russia holds on to the territory gained without having
an army station in the freed territories on a permanent basis
because Ukraine will cry foul and attack when they can.
Russia has always been a magnet for intruders because
of its potential riches and vastness.
There was a time when Yeltsin and his cronies were popular
they grabbed the state's assets and sold them down the Volga.
This was abruptly stopped, to the chagrin of the west
once more; Russia was the enemy.
I’m not partial to the Russian government’s plan, but as I see it
Russia has to occupy the whole of Ukraine and install a regime
that is permanently neutral and let Ukraine be a member
of the Russian federation.
In any case, the war must stop as thousands of young soldiers
die for the wrong reasons and the civilians are bombed senseless.