'For Pakistani nationals, Pakistan has pointed to lack of extradition treaty and lack of evidence,' he said. 'We have made 11 futile attempts with Pakistan to conclude an extradition treaty,' he added.

Pakistan has not responded 'positively to our proposals to conclude an extradition treaty', he said.

'We have been impressing upon Pakistan that it is in the interest of both countries that we enter into a treaty of extradition,' Krishna said. 'Government is endeavouring to persuade Pakistan to develop a cooperative relationship with India.'

Echoing Manmohan Singh's message to parliament during his intervention in parliament Wednesday where he said there is no alternative to engagement with a neighbour, Krishna stressed that India will continue to improve relations with Pakistan despite Islamabad's reluctance.

'In spite of Pakistan's reluctance to help us to improve our relations, India's endeavour will be to continue to impress upon Pakistan that we have to have good neighbourly relations,' he said.

'Our hope is that Pakistan will see sense in such kind of approach,' he added.