Mr. Rubeish, the latest of a half-dozen senior Qaeda operatives killed by American strikes in Yemen over the past year, was drawn into the terrorist network as a young man and rose nearly to the top of Al Qaeda’s most dangerous affiliate. The statement said Mr. Rubeish “spent nearly two decades as a mujahid,” an Islamic fighter, “in the cause of Allah, battling against America and its agents,” according to a translation by the Site Intelligence Group.
American counterterrorism officials say that killing operatives of the Yemen affiliate has kept it off balance, making it harder to plot against the United States. But in the judgment of most experts, the Qaeda branch there is at least as strong as it was before American drone strikes began in Yemen in 2009, in part as a result of political chaos in the country.
But Gerald M. Feierstein, a senior diplomat who was ambassador to Yemen from 2010 to 2013, called the death of Mr. Rubeish a “major setback” for the Qaeda franchise. He said that he had no details on the attack, but that it appeared to show that the United States could carry out strikes without a stable government in Yemen to offer support.
“At this particular moment, they might feel they’re operating with a certain level of impunity,” Mr. Feierstein said of the Qaeda branch, speaking in an interview after a congressional hearing on Yemen. “If we can deny them that assurance, that’s a good thing.”