Pakistan has obligation under international law to hand over Azhar to countries where he has committed crime, the sources said, adding absence of Extradition Treaty would not mean anything if Islamabad has the will to cooperate.

India is apprehensive on sharing of evidence on account of strong conviction that terror groups like LeT enjoy patronage and support of elements in Pakistani army and ISI, which is indicative by "cover-up" attempts underway in that country.

After the Kabul embassy attack, New Delhi had provided evidence to Islamabad about involvement of elements based in Pakistan, but there was no cooperation despite promises, the sources said.

Highlighting Pakistan's lack of sincerity, they said that after the Mumbai attacks, action was taken against Jamaat-ud-Dawa activists, the frontal organisation of LeT, but within days many of them were released.

India feels Pakistan is seeking to create a war hysteria to divert attention from the main issue of cooperating in bringing to justice the culprits of November 26 Mumbai attacks.

New Delhi feels that the elected government in Pakistan is not really in control of things which is evident by its flip-flop on Mumbai attacks and U-turn on its offer to send ISI Director General.

The existence of multiple centres of power in Pakistan is making it difficult for India to deal with the problem. "We are dealing with many Pakistans. We do not know which Pakistan is saying what," the sources said.

India also sees this flip-flop in Pakistan being an indicator of the growing pressure on the country.

Feeling that the situation this time is different than that in the aftermath of attack on Parliament in 2001, India says the response too has to be unlike the last episode when it mobilised armed forces and called back the High Commissioner.

Elaborating on the argument, the sources said Pakistan and its players now are "different" and "several", unlike 2001 when the country was ruled by 'Chief Executive' Gen Pervez Musharraf.

While utilising all means, including diplomacy, to build pressure on Pakistan, India, however, is not thinking of suspending road, rail or air links like the past though the composite dialogue has been put on hold.

India is working with the international community to build pressure on Pakistan and has succeeded to a large extent in this, with most nations, including the US and UK, convinced that LeT was involved and Islamabad needed to act.

New Delhi feels that the US has leverage that it can use to force Pakistan to act, particularly in view of the current financial crisis.

India is also working with countries like Saudi Arabia and China, which are Pakistan's close allies, and both have conveyed the "right things" with regard to the Mumbai attacks and the aftermath.

Saudi Foreign Minister will be arriving here soon to further discuss the issue. China also demonstrated its opposition to Pakistan over the Mumbai attacks when it lifted its hold on a UN Security Council proposal to ban Jamaat-ud-Dawa.

Even as India expects the international community to mount pressure on Pakistan, it realises that ultimately the problem concerns it and will have to deal with it with the support of the world community.