Absolutely in the first week and who knows after that.
The UK has already started talking about sending trainers into Ukraine, if that happens UK soldiers become legitimate targets, if the US follows suit, that will trigger real fighting between NATO and Russia.
Even is the US and UK conduct some type of false flag operation, they will not allow Ukraine to lose this war without fighting themselves.
Sending your troops into a non-Nato country at war, then having them attacked, does not trigger a NATO response
Article 6