F-21 (or Viper Block 72) interestingly is what LM pitch toward made in India....and they are selling them as "only a notch below F-22" (Their words, not mine)
Meet the F-21, specifically configured for the Indian Air Force, with unmatched 'Make in India' opportunities for advanced airpower.
www.lockheedmartin.com
The Viper program was co-developed by Taiwan as per Wikipedia (Source no longer exist to be verified) but currently, only Taiwan, Bahrain and Israel operate F-16V Block72/F-21
Rumor also has it that LM is helping Taiwan to design their own 5th Generation Fighter, based on KF-21 (which LM heavily involved) design with the same engine.
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