Ironic

The moral philosopher Peter Singer, along with Kenneth Roth,[5] has cited Israel's prosecution of Adolf Eichmann in 1961 as an assertion of universal jurisdiction. He claims that while Israel did invoke a statute specific to Nazi crimes against Jews, its Supreme Court claimed universal jurisdiction over crimes against humanity.[59]

Eichmann's defense lawyer argued that Israel did not have jurisdiction on account of Israel not having come into existence until 1948. The Genocide Convention also did not come into effect until 1951, and the Genocide Convention does not automatically provide for universal jurisdiction. It is also argued that Israeli agents obtained Eichmann illegally, violating international law when they seized and kidnapped Eichmann, and brought him to Israel to stand trial. The Argentinian government settled the dispute diplomatically with Israel.[60]

Israel argued universal jurisdiction based on the "universal character of the crimes in question" and that the crimes committed by Eichmann were not only in violation of Israel law, but were considered "grave offenses against the law of nations itself".[60] It also asserted that the crime of genocide is covered under international customary law. As a supplemental form of jurisdiction, a further argument is made on the basis of protective jurisdiction. Protective jurisdiction is a principle that "provides that states may exercise jurisdiction over aliens who have committed an act abroad which is deemed prejudicial to the security of the particular state concerned".[60]

https://en.wikipedia.org/wiki/Universal_jurisdiction