Yet even the police employ negotiators when a hostage is involved. Today the hostage is Ukraine but they won't be the last. The cost of taking a hostage has to be shown to be too great to repeat. But meanwhile, we should do what we can to secure the release of the hostagePutin is a gangster and a terrorist.
There is nothing to negotiate with criminals.
If he acheives something in 4 years it will be the same somewhere else, maybe even befor with Transninstria vs Moldova.
Every country with nukes (China?) will feel allowed to invade and bully a non Nato country.
The naked truth is that every powerful country is already free to invade and bully countries without powerful alliances. That risk cannot be eliminated. But when it happens we must show the cost to be too high.