There are some good points to ponder.
No matter how it ends, Russia doesn't get a NATO-hosted victory parade. In fact, no matter how it ends, Russia keeps its Pariah status for another generation or two.
Keeping the war going does
NOT weaken NATO, quite the opposite.
Ukraine will keep punching. They will punch more effectively with aid and arms from NATO and the western powers. In other words- as long as Ukraine keeps punching,
Russia gets weaker.