I wonder what Trudeau's plan was. Announcing a link without being able to provide evidence is really no different than not having evidence. In the meantime it has hurt relations with India, and hasn't really helped Trudeau domestically.

Maybe the idea was that making it public would mean India would think twice about doing it again? Maybe it's to get India to publicly commit to a denial, giving them enough rope to hang themselves, and then to present the evidence? So far, the strategy doesn't seem to be a very good one.