Apple is subject to the warrant as presented they have sufficient us contacts to be subject to US jurisdiction.
Apple did not fight us jurisdiction.
Fine. Execute the search warrant. You'll find nothing because:
1) The don't own the phone and
2) The ability to crack the encryption doesn't yet exist
The problem with the court order is that it is not a just an "order", it is an apparatchik diktat of an out of control government. They are ordering Apple to find a way to hack the phone. They could just as easily point the finger at any IT guy and conscript him into service. This is about whether the government has the authority to order Apple to develop a way to defeat their own product.