Vice President Hamid Ansari today said that the countries should unite and fight all forms and manifestations of terrorism. Addressing the 3rd Counter terrorism conference in New Delhi, Mr Ansari said, states sponsoring terrorism must be isolated by international community and forced to abandon the use of terrorism as a tool of state policy. <br/><br/>He said, in recent years nothing has caused greater pain, disruption and inconvenience to societies, governments and individuals than the phenomenon of terrorism. <br/>'<br/>Mr Ansari said, security in the Indian Ocean region is capricious on account of a complex set of problems inherited from its recent past. He said, the most virulent factor fuelling terrorism is state sponsorship of and collusion with terrorists and a case in point is Pakistan's use of extremist groups as an instrument of foreign policy is well documented. <br/><br/>He further said that it is not sustainable for countries to continue to address terrorism or transnational crime from a narrow national interest perspective, nor can development be viewed as a standalone endeavour independent from security. <br/><br/>