Would U.S. legal ethics rules prevent a U.S. lawyer from advising Snowden on where he could go to minimize the chance of extradition and how to get there with least risk of capture?

Would U.S. legal ethics rules prevent a U.S. lawyer from advising Snowden on where he could go to minimize the chance of extradition and how to get there with least risk of capture? Go here for a discussion on the issue.