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In justifying its seizure of power, the military has alleged widespread fraud in the November elections, which Suu Kyi's party won in a landslide, and promised fresh polls in a year.
But its ambassador to the United Nations on Friday broke ranks and made an emotional appeal to the international community for "the strongest possible action... to restore democracy".
Kyaw Moe Tun also pleaded with his "brothers and sisters" in Burmese to keep fighting.
"This revolution must win," he said, flashing the three-finger salute that has become a symbol of resistance against the junta.
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By Saturday night, state-run TV announced that Kyaw Moe Tun was no longer Myanmar's UN ambassador.