London, Sep 19 (DPA) Pakistani President Asif Ali Zardari Friday urged the international community to support his government's efforts to make democracy in his country 'sustainable and irreversible'.

In a speech delivered to the International Institute for Strategic Studies (IISS) in London, Zardari said he was determined to overcome the 'great challenges' currently faced by the leadership in Pakistan.

'We are passing through difficult times,' he said, adding that bold decisions were needed to tackle a 'crisis in waiting'.

He stressed that militants and militancy in Pakistan were not created in a vacuum and blamed 'mistakes' of the past for the emergence and encouragement of religious extremism.

'Sadly, what we are witnessing today is the outcome of that policy of the 80's and even earlier. The policy of using religious extremism as an instrument of war,' said Zardari.

In his view, the mistakes of the past included leaving Afghanistan 'at the mercy of the warlords' and Western support for 'dictatorships' in Pakistan.

'Years of dancing with the dictators has encouraged the crisis of today,' said Zardari.