DUBAI, United Arab Emirates (AP) — An Iranian-flagged oil tanker pursued by the U.S. amid heightened tensions between Tehran and Washington changed its listed destination to a port in Turkey early Saturday after Greece said it wouldn’t risk its relations with America by aiding it.

Meanwhile, Iran sanctioned a prominent Washington-based think tank that led criticism of Tehran’s 2015 nuclear deal with world powers over its alleged “economic terrorism,” something the organization described as a “badge of honor.”

The crew of the oil tanker Adrian Darya 1, formerly known as the Grace 1, updated its listed destination in its Automatic Identification System to Mersin, Turkey, a port city in the country’s south and home to an oil terminal.

However, mariners can input any destination into the AIS, so Turkey may not be its true destination. Mersin is some 125 miles northwest of a refinery in Baniyas, Syria, where authorities alleged the Adrian Darya had been heading before being seized off Gibraltar in early July.

Iranian state media did not acknowledge the new reported destination of the Adrian Darya, which carries 2.1 million barrels of Iranian crude oil worth some $130 million. Nor was there any immediate reaction from Turkey, whose President Recep Tayyip Erdogan deals directly with Tehran and Russia over Syria’s long war.

The ship-tracking website MarineTraffic.com showed the Adrian Darya’s position as just south of Sicily in the Mediterranean Sea. At current speeds, it estimated the Adrian Darya would reach Mersin in about a week.

The State Department said it had “conveyed our strong position to ALL ports in the Mediterranean that should be forewarned about facilitating Grace 1,” without elaborating.

The Adrian Darya’s detention and later release by Gibraltar have added fuel to the growing tensions between Washington and Tehran, after Trump unilaterally withdrew America from Iran’s 2015 nuclear deal with world powers over a year ago over concerns about Iran’s ballistic missile program and regional influence. In the time since, Iran lost billions of dollars in business deals allowed by the deal, as the U.S. re-imposed and created sanctions largely blocking Tehran from selling crude oil aboard, a crucial source of hard currency for the Islamic Republic.

In U.S. federal court documents, authorities allege the Adrian Grace’s true owner is Iran’s Revolutionary Guard, a paramilitary organization answerable only to Supreme Leader Ayatollah Ali Khamenei. The U.S. declared the Guard a foreign terror organization in April, the first time America named a military force of a nation as such, giving it the legal power to issue a warrant for the vessel’s seizure. However, that would require another nation to acknowledge the writ.