The Ukrainian operation was “grounds for a nuclear attack,” declared Vladmir Solovyov, a firebrand host on Russian state TV, ...

The most famous disaster in the history of nuclear power was the result of many small problems—but perhaps the most important problem was the unrecognized presence of a “neutron poison.” ...

Donald Trump imposed more than 1,000 sanctions on Iran as president, but one of them could prove to be a “poison pill” that derails an effort by his successor to revive the 2015 nuclear deal ...