@Anonymous , based on your response, you are a Resident for Tax purposes. Thus you recognize income(s) on form 1040 and taxed on world income. Article 20 of the Tax Treaty does not give you any special privileges, except for non-taxability of foreign sourced monies ( stipends / family help etc. ) for surviving expenses.
Also note that as a trainee ( not employee ) you are immune from FICA regs.
Is there more I can do for you ?
