Please, Everyone, do not let this get political, as that's not what is intended here. Many countries as you might know, do not allow the exportation of their coins or "National Treasures". So, how do you see possible trade sanctions affecting the exportation of other coins to our country? Certainly this will not likely affect friendly countries, but many of you collect foreign coins and silver/gold bullion from other foreign countries. Should this be of concern to any of us/you?
Personally I am guessing that it will be sort of a tit-for-tat situation, in the markets where there is enough trade for it to make a difference. I don't agree that ".... it will not likely affect friendly countries" as we have already seen the start of it, and it is within those friendly countries. If the US puts an import tax let's say on cars from Mexico, then it wouldn't surprise me at all if Mexico put a tax on something that affected Americans (travel, maybe). I doubt anyone gets to the level of announcing a tariff on "everything" or specifically bullion.
Mexico is already talking of cutting corn imports from the USA. An interesting thing though is a tax on cars made in Mexico would hurt the American car manufactures like Ford and GM.