[Crisis Group] Sudan's calamitous three-month war may be entering a critical new phase. In recent weeks, the paramilitary Rapid Support Forces (RSF) has further entrenched its superior position in the capital, Khartoum, and intensified a siege of the headquarters where top generals in the Sudanese army, its enemy in the conflict, have been holed up since the war began. Army leaders have shown a new willingness to entertain peace talks, while the paramilitary claims victory is nigh. What comes next is uncertain, but