Burma's junta has refused to allow visiting UN Secretary General Ban Ki-moon to meet jailed opposition leader Aung San Suu Kyi.
Mr Ban was told of the refusal when he held a second round of talks with military leader Gen Than Shwe.
"I'm deeply disappointed," he told reporters. "I'm very sorry to report to you that this is not possible."
Ms Suu Kyi's trial on charges of breaking the terms of her house arrest was postponed again on Friday.
Mr Ban said Than Shwe had told him during their 30-minute meeting, in the remote administrative capital Nay Pyi Taw, that Ms Suu Kyi was on trial and he did not want to interfere with the judicial process.
The UN leader later left for Burma's main city, Rangoon.
Mr Ban's had a two-hour meeting with Gen Than Shwe on Friday.
A LIFE IN DETENTION
1988: Junta comes to power after crushing pro-democracy uprising
1989: Martial law declared; opposition NLD leader Aung San Suu Kyi put under house arrest
1990: NLD wins elections; result rejected by the ruling junta
1995: Suu Kyi freed from house arrest; movements restricted
Sept 2000: Under house arrest for trying to defy travel curbs
May 2002: Released unconditionally
May 2003: Detained after clash between NLD and junta forces
Sep 2003: Home after surgery, under effective house arrest
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