The Non-Western axis has been turning up the heat, there's been something like 8 or 9 coups in Africa since 2020 plus more coup attempts, there was the Myanmar coup in 2021 you've got troop build up along the Serbia-Kosovo border, you've got fighting again in Azerbaijan and Armenia, and now Israel and Hamas. I expect more and more of these coups and conflicts will arise in the coming year or two as the Non Western powers try to stretch Western military resources.
The future historians will consider the true start to be whenever a NATO country is officially drawn into one of the fights, the same way the UK and France were drawn in to the conflict in WW2 after Poland was invaded.