I have come up with an answer to these scams:

I am pleased that you are asking for my assistance. As it happens, I will be in your country next Tuesday and will be pleased to meet with your representative. In the event that I am satisfied with his presentation and see bona fides of his sincerity [Hard cash {Dollars or Euros} is preferable.] I will be happy to assist you in resolving this problem. Thank you very much for your interest.

Please reply with details of where and when we can meet.

PS: A copy of both your missive and mine has been forwarded to my cousin who works for Interpol.