Bloomberg | Golnar Motevalli: With a plane ticket booked, graphic designer Najmeh Mohammadi headed to the currency traders on Tehran�s Manouchehri Street at 6 a.m. on Tuesday for the dollars she needed for her overseas travel. By midday, she was still waiting -- and losing hope.

The 35-year-old was among those hoping to buy greenbacks at a new rate of 42,000 rials set hours earlier as authorities tried to stem a sharp decline in the local currency that�s roiling business and political circles. The immediate effect of the late-night announcement was confusion and a freezing up of trades as dealers awaited instructions from the central bank.

�I may have to cancel my trip,� said a resigned Mohammadi.

As Iran�s confrontation with the Trump administration and U.S. regional allies heats up, its rulers are attempting to avert a currency crisis that would add to their domestic woes. But in a country with a complex forex system and substantial black market that are regularly buffeted by factional feuding and geopolitical tension, finding a solution isn�t easy.

In parliament Tuesday, central bank Governor Valiollah Seif pointed the finger at Iran�s foes, saying: �Enemies outside of our borders, in various different guises, are fueling this issue and are going to some effort to make conditions tougher for the people.�

Trump Deadline

The escalating standoff with the U.S. -- including over Tehran�s support for Syria�s Bashar al-Assad -- is threatening the longevity of an already under-performing 2015 nuclear deal that underpins the Iranian government�s economic agenda. President Donald Trump has set a May 12 deadline for his decision on whether to stick with the pact, and filled two senior roles in his administration with Iran hawks who oppose it.

Other officials in President Hassan Rouhani�s government say there�s no economic rationale for the currency slide, and have suggested conservative opponents are fueling it to discredit the administration.

�One of Rouhani�s main first-term achievements was to stabilize the foreign-exchange market even before his second achievement, the nuclear deal, was concluded,� said Ali Vaez, senior Iran analyst at International Crisis Group. �Now both are crumbling. Whether Rouhani�s rivals are contributing to the fiasco or not, they are benefiting from it.�

New Rate

Rouhani won power in 2013 with a vow to repair an economy hollowed out by international sanctions imposed over Iran�s nuclear program. The currency had plummeted in the last years of his predecessor�s rule, while inflation soared above 40 percent. He stabilized the rial and prices early on, and then sealed the agreement to re-enter the global economy.

Yet the rewards the pact promised haven�t arrived, with investors wary of infringing remaining U.S. curbs linked to the Islamic Republic�s missile development and its ties to groups designated as terrorists by some Western nations. Iranians have grown increasingly irate over the slow pace of change, leading to days of anti-government protests from late December.

The new rate for the dollar -- which had previously sold for 49,500 rials -- was in large part intended to quash the black market. There, the greenback had recently been trading for 60,000 rials, a 50 percent drop from a year ago, putting pressure on official rates.

Regional Rivalry

On Wednesday, police said they arrested 12 people selling currency illegally and identified a group running an online operation without a license, the semi-official Tasnim new agency reported.

Over at one of Tehran�s licensed foreign-exchange offices, there was still no business. Five men sat behind a glass counter either counting prayer beads or taking calls on multiple phones while waiting for word from the central bank. Government spokesman Mohammad Bagher Nobakht said it could take �two or three days� for circulars to reach all dealers.

Seif, the bank�s governor, told parliament Tuesday that Iran had enough foreign-exchange reserves to meet demand and that volatility couldn�t be explained by economic factors.

�Footprints can be seen from elsewhere, and even our surrounding countries including the United Arab Emirates and Saudi Arabia are not blameless in these fluctuations,� he said, referring to two Sunni Gulf states who oppose Shiite Iran�s growing role in the region.

One of the underemployed Manouchehri Street traders, Hamid, saw it differently. �Ordinary people feel the dollar is a better investment,� he said.