Indian strategic relations with Israel are mostly kept low-profile. But Israeli assistance was vital in one of the most vital Indian defence  projects…Ballistic Missile Defence. Following excerpt from

http://ajaishukla.blogspot.com/search?updated-max=2008-02-03T12%3A30%3A00%2B05%3A30&max-results;=7

puts more light on it 

Dr Abdul Kalam was already overseeing the Integrated Guided Missile Development Programme (IGMDP); he began feasibility studies on an ABM programme as well. The DRDO’s first challenge was to develop a radar, which could pick up enemy ballistic missiles being launched from up to 300 kilometres away. The longest range Indian radar was the Rajendra, with a range of 60 kilometres, and there simply wasn’t the time to develop a long-range radar from scratch. The only option was foreign collaboration. Dr Abdul Kalam put one of his top scientists, Dr VK Saraswat, in charge.

Dr Saraswat recounts how Russia was first approached, but the conditions in Russia — with defence R&D; at an all time low — made the DRDO reject that option. It was then that the Israeli ABM programme —- the Arrow-1, based upon the long-range Green Pine radar — caught the DRDO’s eye. A delegation was sent to Israel, but it was turned down because the Green Pine radar incorporated US technology. But Israel did agree to collaborate with India in building a Long Range Tracking Radar (LRTR), which could form the basis for India’s ABM system.

Dr Saraswat rejects reports that the LRTR in India’s ABM system is actually the Israeli Green Pine radar. He stated, “The LRTR is actually a radar built by (a DRDO laboratory) the Electronics and Radar Development Establishment (LRDE) in Bangalore, in collaboration with Israeli company, ELTA. It is not the Green Pine. The technology of the Green Pine may be built into this, but not even a single module of Green Pine is in (the LRTR). If we had done that, the Americans would have stopped the flow of technology to Israel.”

Also needed for the system was a guidance radar, to track the incoming enemy missile. LRDE, explains Dr Saraswat, has developed that radar in collaboration with French company, Thales.

(Pitures coursey: http://frontierindia.net/indian-endo-atmospheric-interception-test-successful)