Answer
The United States and United Nations Security Council froze Fakhrizadeh's assets in the mid-2000s due to his suspected involvement in the development of nuclear weapons. The US Treasury Department designated Fakhrizadeh as a Specially Designated National in October 2007, citing his role in the development of nuclear weapons and ballistic missiles. The UN Security Council also imposed sanctions on Fakhrizadeh in 2007, citing his involvement in nuclear proliferation activities.