Sanctioned by the United States on April 1, 2004 under the Iran Nonproliferation Act of 2000, for transferring to Iran equipment and/or technology of proliferation significance since January 1, 1999.

Doctor of technical sciences, professor and head of the Department 205 - Technologies for Producing Engines for Flying Apparata at the Moscow Aviation Institute (MAI), which was sanctioned by the U.S. Department of State on January 8, 1999 for engaging in proliferation activities related to Iran's nuclear and/or missile programs; the department teaches technologies related to rocket, missile and aircraft engines, including those reliant on liquid and solid fuel and internal combustion.

Vorobey is reportedly an expert in the use of composite materials in rocket production; reportedly traveled to Iran a dozen times between 1996 and 2000 with other missile experts to teach and work with the Iranian Energy Ministry (a front for missile procurement efforts, according to U.S. officials) on several projects, including designing high-tech joints, methods of producing turbine-based machines, and a study of various types of springs; reportedly sought to disguise this cooperation by establishing a private business outside MAI.