I think you’ve been reading too many breathless articles in the media (many of whom have been predicting world war 3 every other week for the past 6 months).
The only person who’s mentioned WW3 on this thread is you. FWIW I don’t think the conflict will escalate beyond a limited exchange of pre warned hostilities. It will be largely performative. But anyone who takes the trouble to read modern history will recognise the marginal risk of things escalating out of control. In such circumstances a larger regional conflict is a possibility.
But hey, don’t worry about such nuances.