CAIRO — The United States on Friday called on Sudan’s military to join talks aimed at calming the country’s grinding conflict as the African country faces a worsening humanitarian crisis. The military has boycotted the negotiations in Geneva, Switzerland, now in their third day, despite international pleas that it take part in the talks. Sudan’s military is battling the powerful paramilitary, known as Rapid Support Forces. “The RSF remains here ready for talks to start; SAF needs to decide to come,” U.S. Special Envoy for Sudan Tom Perriello posted on X on Friday, using the acronym for Sudan’s Armed Forces. Diplomats from Saudi Arabia, Egypt, the United Arab Emirates, the African Union and the United Nations were at the talks, which started earlier this week. Sudan’s paramilitary sent a delegation to Geneva. On Thursday, Sudan’s governing council, which is led by top military generals, announced that they had opened the key border crossing of Adre, from neighboring Chad into Sudan’s restive western region of Darfur, which has been the worst hit by fighting and displacement. …