Legal Question in Business Law in California

I do not believe that there is a problem with your business partner living in Europe and being a foreign citizen. There is no requirement that he has to be physically present in the state to properly execute the appropriate documents. In answering your question, whether you can use the power of attorney depends on what powers are expressed in the document. I would be extremely hesitant in using such power even if it is expressly stated because it could add an additional issue if things go south. Please feel free to call me if you are seeking an attorney to assist you in this matter.