Islamabad (AFP) – Pakistan on Saturday summoned the US ambassador for an explanation after President Joe Biden described the South Asian country as “one of the most dangerous nations in the world” and questioned its nuclear weapons safety protocols. Biden made the apparently off-the-cuff remark late Thursday while talking about United States foreign policy during a private Democratic Party fundraiser in California, but the White House later published a transcript of his comments, which sparked outrage in Pakistan. Washington’s relations with Pakistan have soured since last year, when the US en…