Yes [0]
> would cooperate in the investigation and sentences would be handed by cooperating judicial systems
They don't really cooperate.
A lot of this is due to mutual red tape, and also because of jurisdictional issues (eg. is transnational crime under the CSIS, the RCMP, the Vancouver PD? Which court does it go to?) because Canada is very similar to India structurally (weird hyper-federalism mixed with federal powers attempting to further gain control).
Also the Indian equivalent of law enforcement isn't the greatest either due to federal-state conflicts along with like 6-8 different competing federal law enforcement agencies, plus a couple national security ones.
[0] - https://torontosun.com/news/national/what-we-know-about-slai...
This whole controversy was unplanned.
There have been ongoing discussions between the Five Eyes and India about this hit and the whole Khalistan issue for months now, but Trudeau's hand was forced after the Globe and Mail (a newspaper that leans Conservative) gave him a 24 hour heads up that an article about this was about to be published.
Someone leaked, and now it's a cluster f.
Canada yet to act on Interpol notices against Khalistani gangsters - https://www.google.com/amp/s/www.hindustantimes.com/india-ne...