US defence giant Lockheed Martin on Friday inked an agreement with the state-run Bharat Electronics Limited (BEL) to explore opportunities in the F-21 fighter jet programme.Lockheed Martin has exclusively offered its F-21 military aircraft to India, with an eye to bag the Indian Air Force’s $18 billion dollar deal to procure 114 jets.”Lockheed Martin signed a memorandum of understanding (MoU) with defence PSU BEL to explore industrial opportunities in the F-21 programme at DefExpo 2020,” the company said in a statement.