Challenge: US military used to restore order in one of its Post Cold War Great Power Allies

With a PoD of 1992, how can we have a scenario where Germany, Britain, France, or Japan lose internal control and request American military assistance over their own population?

It sounds like a reach. Is it feasible under any scenario?
 
You're right, it does sound like a reach, but I'm going to try and make it work. Keep in mind, I am stretching plausibility here like a rubber band.

The only scenario I could see where Japan loses all semblance of law and order is if Aum Shinrikyo launches terror attacks on a wider scale than they did in our timeline. From the Council of Foreign Relations website.

Originally, Aum planned to massacre citizens by spraying botulin, the most lethal natural poison to humans, from buildings and modified delivery vans. Aum’s team of young scientists cultured and experimented with biological toxins, including botulin, anthrax, cholera, and Q fever. The transition to chemical weapons came after biological attacks failed. Investigations and raids after the subway attack showed that Aum was capable of producing thousands of kilograms of sarin a year, according to the Center for Disease Control (CDC). The cult had also acquired a Russian military helicopter that could have been used to distribute the gas, the police said.

Initial plots failed to produce the deadly chaos that Aum wanted, although one incident in June 1993 in which Anthrax spores were released from a Tokyo building caused a foul odor in addition to the deaths of some birds, plants, and pets. According to the CDC, Aum sent a fact-finding team to Zaire to study and collect Ebola virus samples in 1993. Aum reportedly sprayed some of the failed batches of biological weapons in the areas surrounding U.S. military bases in the early attempts involving botulin, according to the New York Times. After the subway attack, the State Department says that Japanese authorities reinvestigated and found Aum responsible for a mysterious attack—that later proved to be sarin—on a residential neighbourhood in 1994 that killed seven and injured over one hundred people

So if these attacks were more successful and killed enough people (Probably a hundred or more), then I see the Japanese public going into a panic. If the group was actually successful in killing US military personnel, then you would be sure of some kind of US military involvement, particularly when it's discovered that the cult is producing biological weapons. Of course, US military involvement would match the cult's insane beliefs that the US would hasten the Armageddon by causing World War III with Japan.
 
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