By Khalid Abdelaziz and Nafisa Eltahir June 25 (Reuters) - Newly issued Sudanese pounds have begun circulating in territory controlled by a paramilitary group fighting the national army, raising questions about the source of the notes and potentially deepening the country's de facto division. The Rapid Support Forces (RSF) - which cooperated with Sudan's armed forces before the two fell out and began fighting a war in April 2023 - now controls large swathes of the country, including the vast western Darfur region.