NEW YORK — Three hard facts set the boundaries for the talks that United Nations negotiator Ibrahim Gambari is undertaking as he shuttles between Myanmar's ruling generals and the detained opposition leader Aung San Suu Kyi.

First, despite the heroic leadership of the Buddhist clergy and the prodemocracy community, almost 50 years of military misrule and terror tactics have worn down Myanmar's people, who will likely find it hard to maintain their defiance unless there are obvious splits among the ruling generals or widespread desertions among ordinary soldiers.

Second, Myanmar's generals know that they face a stark choice: Either maintain power or risk imprisonment, exile, and possible death. In their eyes, this leaves them with virtually no choice but to hold on to power at all costs.