Since 2011, the International Committee of the Red Cross (ICRC) has been engaged in a project to revise and update its Commentaries on the 1949 Geneva Conventions and their 1977 Additional Protocols.
After weeks of threats, the United States, joined by Israel, has launched military strikes against Iran. It remains to be seen whether these strikes will be fairly limited, or are the opening of an extended conflict.
Prior to the establishment of the World Trade Organisation (WTO) and the General Agreement on Tariffs and Trade (GATT), tariffs routinely functioned as deliberate instruments of industrial policy.
The UK government has been careful in not directly supporting the ongoing US-Israeli use of force against Iran. This is at least partly because (I'm sure) the internal view within the government is that the use of force is illegal.