CHICAGO (AP) — A hearing has been delayed for a Taiwanese man accused of trying to bypass bans on supplying weapons machinery to North Korea who planned to change his plea to guilty.

A brief court docket entry for Hsien Tai Tsai (SEHN’ SUHN’ SEYE’) says the change-of-plea hearing will now happen in Chicago on Friday. It doesn’t explain why the hearing was rescheduled from Thursday.

The 68-year-old man has been charged with conspiring to thwart laws on the proliferation of weapons of mass destruction. It’s unclear what counts Tsai will plead guilty to.

He was arrested while visiting Estonia. The Baltic Sea-coast nation worked with the U.S. to capture him, then jailed him for five months. Estonia extradited Tsai a year ago.

Tsai’s son was arrested last year on similar charges.

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