WASHINGTON:- USinfo-icon President Donald Trumpinfo-icon's decision to pull out of the Iraninfo-icon nuclear accord and re-impose sanctions on Tehraninfo-icon threatens to derail a project to help build Afghanistaninfo-icon's economyinfo-icon, endangering a key goal of the US strategy to end Americainfo-icon's longest warinfo-icon.

The Indian-backed Chabahar port complex in Iran is being developed as part of a new transportation corridor for land-locked Afghanistan that could potentially open the way for millions of dollars in trade and cut its dependence on Pakistaninfo-icon.

Building Afghanistan's economy would also slash Kabul's dependence on foreign aid and put a major dent in the illicit opium trade, the Taliban's main revenue source.

But Trump's decision to re-impose sanctions on Iran and penalise financial institutions for doing businessinfo-icon with Tehran is clouding Chabahar's viability as banks, nervous they could be hit with crippling penalties, pull back from financing.

"President Trumpinfo-icon's decision has brought us back to the drawing board and we will have to renegotiate terms and conditions on using Chabahar," a senior Indian diplomat said. "It is a route that can change the way Indiainfo-icon-Iran-Afghanistan do business, but for now everything is in a state of uncertainty."

The White House did not respond to requests for comment.

Launched in 2016, the joint Iran-India-Afghanistan Chabahar project already is facing holdups. It has yet to see significant traffic apart from some containers of donated wheat from India, and the first shipments of Afghan dried fruit to India are not expected before July.

At least three contracts to build infrastructure at the port now have been delayed, with two Chinese companies and a Finnish group left hanging while bankers seek clarity from Washington before approving guarantees, a person close to the project said.

In addition, Afghan traders, who were hoping for an alternative to Karachi port, now find themselves cut off from funding and forced to rely on the traditional hawala money transfer system, which is insufficient on its own to transform an economy.

"We know our correspondent banks would not let us pay for imports coming through that port," said a senior executive at a major Afghan lender.