This will all end round a negotiation table.
The west doesn't want a hot conflict with Russia, and Russia doesn't want one with the west.
There's a lot of dick waving going on by all sides which ultimately is all about bargaining chips when everyone gets round a table.
I want Russia to fuck off out of Ukraine and Crimea as well but it's realistically not going to happen.
There will be territorial concessions in the end, Ukraine will get some cash for rebuilding, Putin can spin it as some sort of 'victory' domestically, and everyone kicks the can down the road until next time he fancies having a go.
It's sad but sooner or later that's how this will end, it's just a question of the details.