Given the cold shoulder he's given Taiwan's president, who is also the first female leader democratically elected in Asia, and how he barely responded to Wang Yi's belligerent behavior in Canada, I'd say Trudeau will do nothing.
When it comes to might vs right, Canada generally sides with might. To be honest, other than the US, the only country I can even imagine standing up to China for the well-being of a 3rd party is Japan.