Washington, July 24 - The top most US military official has said Pakistan's spy agency ISI has been 'fomenting chaos' in Kashmir and advised Islamabad to restrain it.

'I believe that in the long run the ISI has to change its strategic thrust which has been to foment chaotic activity, you know, in its border countries. And I think in the long run ... and that has been a Pakistan view to its own survival and its own security. And I think in the long run that's got to change,' the US' chairman of the joint chiefs of staff Admiral Michael Mullen told the Al Jazeera news channel in an extensive interview.

Admiral Mullen, the senior most military officer in the US, has served as chairman of the joint chiefs of staff under both George Bush and Barack Obama, helming two wars.

Asked to elaborate on his comments, Mullen said: 'What I mean is that they have clearly focused on support of ... historically of militant organisations both east and west. I mean that's been a focus of theirs in Kashmir historically as well as in FATA (Federally Administered Tribal Areas). And I think ... that fundamentally has to change.'

'And there are discussions which have been ongoing in respect to that and the leadership recognises that, and there is a big challenge dealing with that, based on what their history is and what they need to do for the future.'

Asked to comment on 'the close - and some people say too close - relationship between the ISI and the Taliban', Mullen replied: 'Well, one of the things I have learned in my frequent visits to Pakistan over the last year - I've been there almost a dozen times - is again that it is another extraordinarily complex relationship.