In today's episode of India Global: India has asked Canadian diplomats in New Delhi to leave the country by Saturday after Ottawa said it was investigating its Indian ambassador and other diplomats as "persons of interest" after the killing last year of a Sikh separatist leader. In a tit-for-tat move, Canada too has asked six Indian diplomats to leave the country after its police claimed to have evidence that they were part of an Indian government's "campaign of violence". NDTV's Gaurie Dwivedi speaks to former diplomat Bhaswati Mukherjee and foreign policy expert Zakir Hussain.