Earlier quoted context omitted.
But I do not understand how a NY prosecutor can subpoena a Japanese business? If you offer services to, or engage in financial transactions with, a person in Jurisdiction A, Jurisdiction A can enforce its laws on you. You should not in any way be surprised by this fact.
That's all well and good, but Mt. Gox likely won't conduct any more business in NY. It gets even more problematic if they don't actually operate any legal entity in the U.S. The U.S. may enforce its laws upon U.S. entities, but it has no authority to do so on e.g. a Japanese one, unless a treaty/agreement exists that facilitates it. This is why China-only companies that engage in IP theft (or vice versa) aren't being…
Mexico has to agree to hand him over, but once the US has him, they can happily convict him of crimes committed while he wasn't physically present in the US.
[1] http://www.npr.org/2014/02/25/282359473/arrest-of-el-chapo-n...