Kind of a cowboy thing to ask
>>>If what you say is true, why can't we confiscate them?
Why would breaking an international agreement be grounds for the US to confiscate something from the Yemenis? Unless the agreement provides for US policing, which I seriously doubt. I don't know what agreement this is, or really, what it says.
You are right that more information is needed. I think you guys jumped way out ahead of this one.