Replying to [mohamadalkady]:
A lot has to do with the level of sensitive items issued by a country to block out any product or service that will help to increase their military arsenal.
Sanctions by the country of origin inhibits sales of products associated with the application to strengthen the destinated nation's advancement in some sensitive areas. However it is extremely difficult, if not impossible to separate commercial and military applications of some general equipment or devices. For example the radar system for civilian use in the airport and for ships can also be used by naval and military air base.
Even medical equipment has to be scrutinized, for example the centrifugal machine, can be used for the purification of uranium.
If your company is a supplier to the military, with either the armoured division, or the navy or air force, all the components and technical data has to be classified under a military code, and they are confidential material available only to top military personnel.
However for the general trading, buying and selling of equipment, goods and commodities, if there is no restrictions, one should sell to any country who wants to buy the product. The Rule of Commercialism takes over top priority in this case and more so it is company to company or people to people relationship, not government to government.
Some time ago, I met a British entreprenuer, and being a reservist Naval Officer, he strongly disagrees with me that politics should not interefere with business. He is supply Cathodic Protection System for ships by Impressed Current. He argued that the specially designed ICCP (Impressed Current Cathodic Protection) system can be used by submarines and frigates to prevent triggering of marine bombs in mine-fields. I must agree with him about the sensitivity of the specially designed ICCP system.
James 007