The delivery is part of a $5.43 billion agreement signed between India and Russia in 2018 for the acquisition of five S-400 regimental systems. File. | Photo Credit: AFP India has received the fourth squadron of the Russia-made S-400 air defence system, strengthening the country’s long-range air defence network. The system arrived from Russia as scheduled in May, and is expected to be deployed in an operational area shortly, sources in the defence sector said. The delivery is part of a $5.43 billion agreement signed between India and Russia in 2018 for the acquisition of five S-400 regimental systems. Three S-400 squadrons have already been inducted into service; the fourth has now arrived, following delays linked to the Russia-Ukraine conflict. The remaining squadron under the original contract is expected to be delivered in 2027, officials said. Deliveries are now back on schedule. The S-400 will be integrated with AI-enabled decision-support capabilities aimed at improving threat prioritisation and target selection, senior defence officials said. “AI-enabled targeting will assist operators in identifying and prioritising aerial threats. All …