We don’t need vehicles which we already have (Su 30s, Migs and Mirages etc) or can produce ourselves (LCA and it’s variants) but weapons and systems which can provide us edge in battlefield and which we can integrate in our own platforms without fear of embargo or interruption in supply at the time of needs.The F-15 is a no go where the IAF is concerned. The F-18 is more probable for the IN. IAF is not interested in the airplane. We are just delaying the inevitable. More Rafale. Followed by indigenous planes. The lower end of the spectrum needs to be filled with the Tejas and its subsequent iterations. The AMCA, is snake oil till 2035.
What we need is collaboration with either RR or GE or Safran for our engines. While we build our engine tech, work with existing players to build a parallel line. Then learnings from this flows into the indigenous engines. This is a 25 year project. If we attempt this in 5 years, we are bound to fail or fall short again.
Buying expensive platforms from US and other western countries seems very expensive and risky proposition.