The radar detected the helicopter at a range of over 150 km and achieved target lock at a range of over 125 km. This indicates that the helicopters were detected at two different ranges, with a different action taken for each.
Instead of dedicating a long time to R&D, they mentioned that they increase product variety through technology transfer by acquiring companies. That's why they acquired the company in South Africa. They might have followed a similar approach here as well.
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