Re: "The whole idea of territoriality is strained"
The real problem is the US courts do not respect any country's borders, except their own - when it suits them.
Correction: It's the US government who doesn't respect anyone's borders.
The US government can make rules/laws allowing them to, for example, subpoena the Kremlin if they want to. Remember, there are more lawyers in the US than the whole of Europe combined.