CEP Senior Advisor Edmund Fitton-Brown writes: As British Ambassador from 2015 to 2017 I saw up close and was involved in negotiating the international response to the Houthi takeover of large parts of Yemen that began in earnest in 2014. I then continued to observe Yemen from a counterterrorism perspective with the United Nations after 2017. The story that has not been adequately told is how the international community got its response right in 2014; but then progressively lost its way over the following four years, ending in the shameful Stockholm Agreement of December 2018.