The United States and Japan have each pledged $1bn (£671m) to Pakistan so far at an international donors conference. The meeting, in Tokyo, is to help Pakistan stabilise its economy amid fears that financial woes could lead to increased support for militant groups.
About 40 countries and organisations are represented at the meeting.
The Japanese Prime Minister, Taro Aso, has said that ensuring stability in Pakistan is key in the fight against terrorism in the southwest Asia region.
Analysts have suggested that a total of up to $6bn might be pledged at the meeting.
We lose, you lose
Pakistan is home to militant groups, many in the lawless northwestern areas bordering Afghanistan.
"Without stability in Pakistan, there is no stability in Afghanistan either," Mr Aso said when opening the conference.
"Stability in border areas is a key and I want to stress that the international community supports comprehensive strategies by the two nations," he said.
Pakistan's President Asif Ali Zardari spoke of his fear that the world does not fully realise the extent of threats facing his country.
The donor conference is the first of its kind for Pakistan
"We are willing to fight. Despite the fact that I lost the mother of my children, I have taken up this challenge," said Mr Zardari, the widower of assassinated former Prime Minister Benazir Bhutto.
"I am hoping, and with all humility, asking of the world to help us fight this tremendous challenge, which not only do we face, but it doesn't end on my border," he said.
"If we lose, you lose. If we lose, the world loses," he said.
Down-payments
The donors' meeting is supported by the World Bank and attendees include China and Saudi Arabia.
The US pledge of $1bn was described as a down-payment on the previously announced $1.5bn already promised to Pakistan for each of the next five years.
Separately, a $7.6 billion bailout has been granted by the International Monetary Fund to avert the country's most recent balance-of-payments crisis.
But Pakistan has resisted international pressure to tax the small landowning elite where most political power resides.
Economic growth is expected to slow to between 2.5% and 3.5% for the year to June 2009, a rate considered too slow to find jobs for Pakistan's population of 170m. Link..
