Nato talking of sending trainers to Ukraine

Nato officials are beginning to talk about sending military trainers to Ukraine to help the Kyiv government fight the Russians. After President Macron's sudden conversion to the idea of sending troops to Ukraine, this new idea is likely to gain some support. Ukraine is in a desperate state and currently losing ground. But crossing the red line and getting Nato involved on the ground in Ukraine? That's a deeply risky proposal but maybe it has become inevitable. The US under Joe Biden won't budge from his adamant postion which is "no US troops" in Ukraine. But could, say, Estonia or Poland or Latvia get more involved because of their fear of what Putin might do in the event of a Ukrainian collapse? But there is one scenario here which could dramatically and significantly lead to a direct controntation with Russia. A Third World War of sorts. If certain Nato members send in troop-trainers and they have Nato logstical backing and then Russia starts to target and kill alliance military personnel, will the rest of the "defensive" organisation, including the US, have to get involved? Then it's war all the way with catastrophic consequences. Do Nato members really want that? It's what Biden has been trying to avoid from the first moment Russian troops crossed the border into Ukraine. I suspect wiser counsel will prevail in the end.