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has about $135 million in the bank in but is unable to use it because the -run central bank cannot convert it to the afghani currency, a senior UNÌýofficial said on Thursday.

Abdallah al Dardari, head of the UNÌýDevelopment Programme in Afghanistan, said the United Nations had taken the USÌýdollars into the country and deposited it with the Afghanistan International Bank "with a clear promise from the central bank that fresh cash will be automatically converted to afghanis."

"This did not happen," he told the ACAMS Global Sanctions Space Summit, adding that UNDP itself has "$30 million stuck at AIB that I cannot convert to afghanis and without afghanis as you can imagine, we cannot implement all our programs."

The Taliban, who seized power in August, banned the use of foreign currency in a country where USÌýdollars were common.

The Islamist group has long been under international sanctions, which the United Nations and aid groups say are now hinderingÌýhumanitarian operations in , where more than half the country's 39 million people suffer extreme hunger and the economy, education and social services face collapse.

Billions of dollars in Afghan central bank reserves and foreign development aid have been frozenÌýto prevent it from falling into Taliban hands. International banks are waryÌýof breaching sanctions, leaving the United Nations and aid groups struggling to get enough money into the country.

Liquidity is also a problem. Al Dardari told ReutersÌýin November that while there was about $4 billion worth of afghanis in the economy, only about $500 million worth was in circulation.

The United Nations and the are discussing a possible swap facility, aid groups and UNÌýofficials have said.

Al Dardari said on Thursday that this would allow cash for humanitarian operations to be paid into a mechanism abroad and then afghanis could be collected "from major traders and mobile companies from inside Afghanistan."

He also said lessons could be learned from a program in Myanmar, where electronic payment systems bypassed the central bank. Myanmar's military have been hit with a raft of sanctions by the United States and others since a coup a year ago.

(Reuters)