China, where cases are largely concentrated within high-risk groups, was praised for its efforts to increase preventative measures for drug users.
UNAids said South Africa had also rapidly increased "efforts to achieve universal access to HIV prevention, treatment, care and support".
But there was a warning that "challenges remain" in the global fight against HIV/Aids, including expanding epidemics in Eastern Europe and Central Asia, and resurgence in new infections in wealthier nations among men who have sex with men.
The UN also called for greater investment in HIV/Aids prevention, warning that there was a $10bn (£6.4bn) shortfall in 2009.
It said those countries most severely affected by HIV/Aids could not handle the crisis with their own resources alone.
"At this turning point flat-lining or reductions in investments will set-back the Aids response and threaten the world’s ability to reach MDG 6," said Mr Sidibe.
"Investing for Aids is a shared responsibility – between development partners and national governments."
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