Putin's demands are intolerable, as are NATO's. Anyone short of a monster would find a compromise. Demons demand more and more war.
When you negotiate with an enemy, you must be very careful not to give him gifts, as every gift makes him stronger, and you weaker.
Giving gifts didnt work with Hitler, and wont work with Putin imo.
Putin aint a monster, but he wants to rebuild USSR/Warsaw Pact and then possibly go beyond that.
He would prefer to do it peacefully, via negotiations, but WAR is fine also for him.
Technically since Ukrainians want to defend, providing them with ammunition is a very cheap way for NATO to stop Russians from expanding west and actually testing NATO.
We have got a new USA president, lets see if he can negotiate peace. Im not optimistic though