Reciprocal sanctions to come after US lists seven entities and five individuals.
Developments in Venezuela one part of troubling picture for the US president.
Defendants alleged to have hacked into computers to access controlled software which they attempted to sell to Iran.
Changes in schedules and definitions come into effect at the end of the month.
Certain existing sanctions are extended to 2018.
Amendments include several changes to the definitions of certain defence and aerospace items.
Proposed changes bring Singapore’s strategic goods control list up to date with the 2016 Wassenaar Arrangement Munitions List.
Siemens said that the movement of gas turbines by a customer to Crimea was ‘against its will’.