Rami Makhlouf, the head of Syria's largest mobile operator Syriatel, has been grappling with authorities over demands that the firm pay $185 million.
Syrian regime on Thursday announced a travel ban on Rami Makhlouf, a Syrian tycoon and cousin of regime leader Bashar al Assad, over money it says he likely owes the state.
Makhlouf, the head of Syria's largest mobile operator Syriatel, has been grappling with authorities over demands that the firm pay $185 million.
Syria's telecoms authority has threatened to take all necessary measures to recover money it says Syriatel owes for maintaining its operating license.
But Makhlouf has called the claims undue and unjust.
On Thursday, the justice ministry published on its Facebook page a court order "temporarily banning the defendant (Makhlouf) from travelling abroad" until the case is resolved or outstanding payments are made to Syria's telecom authority.
The document, signed on May 20, said the ban was requested by the telecoms minister and the general manager of Syria's telecoms authority in a lawsuit they filed against Makhlouf.
"The court finds that it is likely the defendant is indebted in light of the documents presented" by the plaintiffs, it said, justifying its decision to impose the travel ban.
Makhlouf, who also has stakes in electricity, oil and real estate, said Tuesday that the telecoms authority was seizing his assets and those of his family.
He said he had also received notice from the government that he would be "banned from working with the state for five years."
Responding to measures against him, Makhlouf has launched a series of online attacks against regime authorities in recent weeks.
At the end of April and again in early May, Makhlouf, who had kept a low profile throughout Syria's nine-year war, said that some people in regime were out to get him and his company.
Analysts have said that this suggests his growing isolation from the centres of power, including Assad himself.
Signs of a spat first emerged last summer, when Syrian regime authorities seized Makhlouf's Al Bustan charity and dissolved militias affiliated to him.
When the finance ministry in December froze the assets of several businessmen over tax evasion and illicit enrichment, the Syrian press said Makhlouf, his wife and companies were among them.
In recent weeks, security services have detained several of Makhlouf's employees -- a move he says is meant to intimidate him into stepping down from his businesses.
According to the Britain-based Syrian Observatory for Human Rights war monitor, dozens of employees from Al Bustan and Syriatel have been arrested since April.