More than 70 countries are represented at a conference focused on rebuilding Afghanistan, which is taking place in The Hague.
Afghan President Hamid Karzai told the conference that Afghanistan needed regional cooperation to tackle terrorism.
Mr Karzai said: 'I welcome the growing recognition that without the true cooperation of Afghanistan's neighbours, the victory over terrorism cannot be assured.'
While Iran's Deputy Foreign Minister warned that any increase in foreign troops in Afghanistan will 'prove ineffective'.
'The presence of foreign forces has not improved things in the country and it seems that an increase in the number of foreign forces will prove ineffective too,' said Mohammad Mehdi Akhoundzadeh.
However, Mr Akhoundzadeh did promise to help fight drug trafficking from the country.
Earlier, US Secretary of State Hillary Clinton urged the countries, organisations and observers taking part to bring constructive ideas to the table, with key elections approaching.
'We are hoping that each neighbour, friend and stakeholder who is participating will have constructive ideas about what that country would do to try to help us achieve the security and stability goals that we set,' she said.
'I think there are a number of ways that different nations can be constructive in supporting Afghanistan,' she said.
Mrs Clinton announced a US donation of €30m to the elections, seen as a litmus test of efforts to spread democracy, more than seven years after the Taliban was ousted.
The European Commission also said it was ready to commit €60m in aid to support the elections, as well as the police and farming sectors in Afghanistan.
The one-day conference puts Pakistan at the epicentre of international efforts, but also attempts to draw in other neighbours, like China and Russia.
'We should recognise that the 'West' cannot solve this alone. I think it is important that we are realistic in that regard, and certainly NATO cannot do this all by itself,' NATO Secretary General Jaap de Hoop Scheffer said.
Iran is taking part in the talks, which were to be opened by UN Secretary General Ban Ki-moon and hosted by the Netherlands, the UN and Afghanistan.
The UN special representative to Afghanistan, the Norwegian diplomat Kai Eide, has said the US cannot be expected to shoulder the burden indefinitely.
