International assistance will help Lebanon out of its economic crisis, but its links with Iran-aligned Hizbullah might hurt its efforts to get it.
The IMF said that all the Arab countries apart from Egypt will see their GDP fall this year.
The five companies bought hundreds of thousands of metric tonnes' worth of oil last year from Iran's state oil company, declaring it to be from Iraq or otherwise disguising its origin.
Iran has propped up the regime in Syria in pursuit of its expansionist agenda, but the Iranian people can ill afford the expense.
The party's ties to Iran and its involvement in conflicts in the region have triggered sanctions and damaged the Lebanese economy.
The Houthis triggered the crisis by banning the use of new banknotes printed by the Central Bank in Aden.
The Iran-backed militia has sought to seize the property and assets of high-level government officials by manipulating the legal process.
The militia, which controls the telecommunications sector, has said the outage is due to a severed submarine cable, but experts blame corruption and mismanagement.
Tens of thousands of workers cannot receive their salaries from the legitimate government anymore after the militia banned the use of new national currency banknotes.
The latest designations of Iran-affiliated entities have proven effective in reducing the IRGC's destabilising efforts to arm and fund the Houthis in Yemen.