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This followed Ottawa's accusation that New Delhi government agents had been involved in the killing of a Sikh separatist leader on Canadian soil.

Modi's attendance comes amid deeply strained relations between the two countries over the murder of a Sikh separatist leader on Canadian soil.

But six months later, Indira Gandhi was assassinated by her Sikh bodyguards in Delhi, and with her, the conversation abruptly died.

But their relationship is "frowned upon" by some in their communities, they say, as Adarsh is Hindu and Nav is Sikh.

Dosanjh and a few others like him, however, have managed to mount it to a global level, their style speaking to both the Sikh diaspora as well as a broader audience.