India signed a $5 billion deal for S-400 missiles in 2018, drawing warnings from the United States that such an acquisition would trigger sanctions as part of a wider programme against Russia. FILE PHOTO: A view shows a new S-400 “Triumph” surface-to-air missile system after its deployment at a military base outside the town of Gvardeysk near Kaliningrad, Russia March 11, 2019. REUTERS/Vitaly Nevar/File Photo Moscow: Russia will begin...