The first squadron of the formidable S-400 Triumf surface-to-air missile system has become virtually operational in northwest India, but the delivery of the second squadron from Russia has been slightly delayed due to the ongoing conflict in Ukraine. IAF got deliveries of the first S-400 squadron in thousands of containers through the air and sea routes in December. IAF is slated to get five S-400 squadrons.The first squadron of the formidable S-400 Triumf surface-to-air missile system has become virtually operational in northwest India, but the delivery of the second squadron from Russia has been slightly delayed due to the ongoing conflict in Ukraine. IAF got deliveries of the first S-400 squadron in thousands of containers through the air and sea routes in December. IAF is slated to get five S-400 squadrons.