An American activist was shot and killed by Israeli forces in the town of Beita, in the occupied West Bank, during a weekly protest against settlement expansion, Palestinian news agency Wafa reported.
The report said the 26-year-old woman was shot in the head, according to the report.
If it happened in Russia I would agree if he broke Russian laws while in Russia, he should face Russian consequences. It all seems really simple to me. If you commit a crime in a foreign country you are typically subject to their laws.
The discussion here is regrading the behavior of the US government when a US citizen was detained by the client regime of the US. These are the services that US would normally offer that were denied in this case https://travel.state.gov/content/travel/en/international-travel/emergencies/arrest-detention.html