Earlier quoted context omitted.
Same goes for Russia, and is all seems pretty relevant. The article seem to indicate that it's much more sustainable for the West than for Russia.
It’s not sustainable for Ukraine.
Both sides are aching (very badly) for this thing to be over, or at least taken off the stove.
One can quibble further as to the details -- which are a matter of metrics, wildcards, politics. And (as recent events have shown) there are still many cards to be played.
But that's the fundamental equation we need to keep in mind.