A Taiwanese businessman has been sentenced to 24 months in prison for “conspiring to violate U.S. laws preventing proliferation of Weapons of Mass Destruction (WMD),” a Department of Justice statement said on Monday.

In October 2014, Hsien Tai Tsai, also known as Alex Tsai, plead guilty to involvement in commercial and financial transactions that circumvented U.S. efforts to limit proliferation activity, specifically with North Korean entities.

“The defendant, Hsien Tai Tsai, 69, pleaded guilty in October 2014, admitting that he conspired with others to interfere with and obstruct U.S. regulations that seek to disrupt the proliferation of weapons of