Danny,
You voluntarily got yourself involved in this situation, for reasons that you have not revealed.  You have met with Ukyo, in person, for a while now, and played a part in his leaving his country while millions of dollars are missing.  You have committed to sharing information and then after a long wait you have shared practically no information.  

I will likely not involve a lawyer because the amount I have at risk is negligible and not worth a lawyer's time, but you are absolutely involved in this and if there is criminal activity then you would have been conspiring with the criminal, concealing criminal information, aiding and abetting.  These involve not just civil, but criminal acts.  

At the very least you need to get legal counsel about what you've gotten yourself into here.  

I can't begin to guess the problems you're going to have as a result of stepping in to this mess and I won't bother to guess as to your motives, how much you know and don't know and what kind of person you are.  But you've gotten yourself involved in secretive acts with the person responsible for $2 million at least that has gone missing and it's pretty clear people aren't getting the missing money back.  How can that have been a wise thing for you, your company or its shareholders?