Chairman Joint Chiefs of Staff Committee General Tariq Majid has said retaining of essential nuclear capability to maintain credible minimum deterrence against any possible aggression is Pakistans compulsion and not a matter of choice. We have to be mindful of the blatant pursuit of military preponderance in our neighbourhood. Growing power imbalance due to continuing build up of massive military machine especially after very exceptional civil nuclear deal and notions of two front wars are all destabilizing trends, carrying implications for Pakistans security, CJCSC told a gathering at National Defence University here Thursday. He said Pakistan has always supported the non proliferation efforts as a responsible nuclear weapon state.