Question

When one country stops all trade with another the country is issuing an

Answer 1

it normally happens when a they have a disagreement with each other over internal policies of the country which is also called embargo

Answer 2

When one country stops all trade with another the country is issuing an Embargo. 

Cuba has been under an embargo from the USA for many years. In order for goods to flow again Cuba must ensure that it is not a threat to the USA.