IIRC the story wasn't as told. Specifically while peace talks were possible the West reminded Ukraine before they began they needed to make clear that there were certain uncompromising demands.

In particular Russia had to leave Ukraine completely. Russia was not willing to put that on the table so peace talks sputtered out.

Note that this doesn't mean the West prevented peace talks. There would have been a lack of fighting for a month or two while the peace talks were going on, sure, but they wouldn't have gone anywhere.

Ukraine said from the moment the invasion slowed down at all they were only going to be willing to accept Russia leaving completely with no land left in their hands.

Russia in turn has always said they want a land bridge to the ocean at minimum.

Until one of those changed peace talks were futile.