Relations between India and Canada have entered a deep freeze after the tit-for-tat expulsion of diplomats following Canadian Prime Minister Justin Trudeau's allegations of an 'Indian hand' in the death of Khalistani separatist Hardeep Singh Nijjar. Delhi has denied these allegations - and both countries have issued high-alert travel advisories for the other. Left, Right & Centre analyses Trudeau's allegations and the diplomatic mess that has followed.