It is difficult to assemble a coalition of the willing to keep or enforce a peace which has not yet been negotiated. So far 25 countries including some outside Europe have been willing to talk, but there has been less clarity about how much money and or how many troops they would each contribute to peace keeping.
Meanwhile the possibility of peace rests on the talks between the US and Russia and the US and Ukraine. Russia has made additional demands to the outline agreement the US has persuaded Ukraine to accept in principle. One of those is no troops from NATO countries to be in any peace keeping force in Ukraine. It has already been accepted that Ukraine will not join NATO.
It is possible Russia could give up this demand but unlikely. It makes NATO countries planning a peacekeeping force premature. It is a very long potential border between Ukraine and Russia, so it would need a large force if the idea is soldiers patrolling a neutral area along the border.
Little is clear about this proposal, save the important point that the European countries of NATO have no power to commit NATO and have no intention of sending any personnel in to help fight the current war. The EU is struggling to increase armament supply to Ukraine to replace the US resources.