Have you seen the Russian "negotiation" position?I mean we could probably try mediating a negotiation instead of just dumping more and more weapons into Ukraine and hammering the Russian populace with sanctions.
It started out as basically "surrender and we'll stop killing you", and has recently evolved to "give us the Donbas, agree that we own Crimea, and give up your weapons".
If Russia are ever going to be brought round to a negotiating position that isn't obviously never going to fly, pressure needs to be applied. Hence the weapon deliveries and sanctions.
Do you really think that this could be resolved purely by negotiations? I don't.