Iranian funds through waivers and a 2023 hostage deal, with some estimates suggesting broader sanctions relief could exceed $50 billion. These funds were restricted to humanitarian use, though critics argue this allowed Iran to reallocate its own resources to fund military activities.
Key details regarding the funds include:

$6 Billion (Hostage Deal): In September 2023, the U.S. allowed South Korea to transfer $6 billion in frozen Iranian oil revenue to banks in Qatar, intended for humanitarian goods in exchange for five American hostages.
$10 Billion (Sanctions Waivers): A sanctions waiver allowed Iran to access an additional $10 billion in funds previously held in Iraq.
Controversy: The funds were intended for humanitarian goods; however, critics have argued that the release of these funds still frees up revenue for other purposes, such as funding militant groups.