It was a piece of news so obscure and implausible that I missed it when it first surfaced last month. The news was that the Russians are going to put hypersonic nuclear missiles into Nicaragua and terrify the Americans into backing down over Ukraine. Or kill them all if they don’t.“If American missile systems can nearly reach Moscow from Ukrainian territory, it’s time for Russia to roll out something powerful closer to the American ‘city on a hill,’” Olga Skabeyeva said on the news show on “Rossiya-1,” the most popular Russian TV channel.Nicaraguan President Daniel Ortega published a decree last...