Years after being a top supplier of weapons against Nepal's Maoist rebels, the United States has acknowledged it has made a turnaround to talk to the guerrillas set to assume government control after sweeping elections. US diplomats have spoken twice to Maoist chief Pushpa Kamal Dahal since his Communist Party of Nepal notched a convincing victory in April elections, but Washington for the first time said it has switched longstanding policy of not negotiating with the once feared insurgents. But the United States is not prepared yet to remove the Maoist group from US terrorist blacklists, under which party officials are barred from visiting the United States and their assets are frozen, Deputy Assistant Secretary of State for South and Central Asian Affairs Evan Feigenbaum told reporters.