A worsening diplomatic crisis between India and Canada will raise near-term risks of protests and tit-for-tat retaliation in the coming weeks. In a Sept. 18 speech before the House of Commons, Canadian Prime Minister Justin Trudeau announced that Canadian security agencies were "actively pursuing credible allegations" that "agents of the government of India" were potentially involved in the June killing of Canadian citizen and Sikh separatist leader Hardeep Singh Nijjar in British Columbia. Trudeau further labeled the alleged incident "an unacceptable violation of our sovereignty." The same day, Canadian Foreign Minister Melanie Joly announced the expulsion of the head of India's foreign intelligence agency in Canada. India has since responded by rejecting the allegations, calling them "absurd" and "unsubstantiated" and accusing Canada of providing "shelter" to Sikh separatist "terrorists and extremists" who "continue to threaten India's sovereignty and territorial integrity." India on Sept. 19 also announced the retaliatory expulsion of...