Published: Oct 21, 2010 3:32 PM EDT
Updated: Oct 21, 2010 12:32 PM EDT

MIAMI (AP) - A Korean-American man is facing prison time after admitting he attempted to buy Russian rocket technology and military gear for South Korea.

Prosecutors seek a sentence of nearly six years for 70-year-old Juhwhan Yun. A South Florida federal judge is scheduled Wednesday to impose sentence.

Yun pleaded guilty in May to illegally trying to broker deals for a rocket propulsion system, SU-27 fighter aircraft and parts and components for a 20-millimeter Russian gun. Yun claims he wanted to help his native South Korea but was not working for the South Korean government.

Prosecutors say Yun has an extensive illicit arms dealing history, including a conviction for an unsuccessful 1989 plot to supply Iran with 500 bombs of sarin nerve gas.