Canada is a small country that foreign powers have a variety of interests in. How do you fight foreign influence when those other governments have 10x or 100x t

Canada is a small country that foreign powers have a variety of interests in. How do you fight foreign influence when those other governments have 10x or 100x the resources and budget to spend on meddling? When they are not shy to threaten the families of ex-pats here? Who brazenly operate "police stations" and monitor their students who come here to study? Or, who hire gangsters to assassinate dissidents who've escaped to here?