Prime Minister Narendra Modi and US President Joe Biden on Friday vowed to “deepen and diversify” the bilateral major defence partnership while welcoming forward movement in India’s procurement of 31 drones and joint development of jet engines.Prime Minister Narendra Modi and US President Joe Biden on Friday vowed to “deepen and diversify” the bilateral major defence partnership while welcoming forward movement in India’s procurement of 31 drones and joint development of jet engines.