> if Russia itself suffers for long enough.

Do you want Russia, a geopolitical entity, to somehow measurably suffer, or do you want an end to pointless bloodshed? Are you willing to put your own life to this lofty goal?

> placating an invading army is the best way to peace.

If you're not capable of repelling the invasion effectively, then yes, this is absolutely true. How could it not be? There's no reason that you can't have peace today and sue for justice tomorrow.