They could declare it was an act of god that caused it and say Obama we’d like to help but we are resource constrained right now...so sorry.
But then they still have assets in the US that could be confiscated by the gov’t. So I guess it depends on which is the better move financially.
I read yesterday that BP has lost something like $40 billion in stocks since this began. They are definitely resource constrained right now. Besides if the very work you are doing is going to be viewed through the lens of a criminal investigation the first thing you do is stop all work.