Mukul Roy quits BJP and returns to Trinamool, Mamata Banerjee says ghar ka ladka wapas aa gaya; Prime Minister Narendra Modi and Uttar Pradesh Chief Minister Yogi Adityanath hold one-on-one meeting in Delhi; Covaxin misses emergency use nod in the US; Dr Anthony Fauci, medical advisor to the US president, speaks to NDTV on extending vaccine intervals, and other top news of the day.
