Not sure if it considered a "international law" but there are treaties about nuclear testing :
https://en.wikipedia.org/wiki/Nuclear_weapons_testing#Treaties_against_testing
Like this one :
https://en.wikipedia.org/wiki/Comprehensive_Nuclear-Test-Ban_Treaty
Now, I'm curious about what the community will think if you put it on metaculus, could be interresting.
Not sure if it considered a "international law" but there are treaties about nuclear testing :
https://en.wikipedia.org/wiki/Nuclear_weapons_testing#Treaties_against_testing
Like this one :
https://en.wikipedia.org/wiki/Comprehensive_Nuclear-Test-Ban_Treaty
Now, I'm curious about what the community will think if you put it on metaculus, could be interresting.