Yes but they probably can't subpoena corporate data/emails to complete the necessary due diligence. They need the FBI to seize evidence, if that even exists.
Depends if Ethiopia believes the US will declare war against Ethiopia, or otherwise destabilise Ethiopia over one token Boing executive being detained fairly-indefinitely.
Pressure on U.S. to cave in on sanctions. Trump refuses.
I wonder if Lion Air will be determined to be the Arch Duke Ferdinand of WW3. Either way would be good to get some actual consequences for decision makers at the top of corporations.
If this is even possible they would do this to trade for the Huwei exec. Also Ethiopia gets a ton of US aid and military support so it wouldn’t be in their interest.